Nearsightedness, also known as myopia, is a common condition that affects the ability to see objects clearly at a distance. It is estimated that approximately 30% of the world’s population is nearsighted, making it one of the most prevalent vision problems.

The causes of nearsightedness are multifactorial, with both genetic and environmental factors playing a role. Several genes have been identified in relation to myopia, including the LEPREL1, CACNB2, and GJD2 genes. Researchers have also found a strong association between nearsightedness and certain general conditions, such as high blood pressure and diabetes.

Testing for nearsightedness can be done through a variety of methods, including visual acuity tests and refraction tests. These tests measure the ability of the eye to focus light and determine the prescription needed for clear vision.

A recent meta-analysis published in the Scientific Reports journal found that nearsightedness is associated with an increased risk of developing several eye diseases, including glaucoma and retinal detachment. This finding further supports the importance of early detection and treatment of nearsightedness.

Inheritance of nearsightedness is not fully understood, but studies have suggested that the condition has a genetic component. It is believed that multiple genes interact to contribute to the development of myopia, with environmental factors also playing a significant role.

In conclusion, nearsightedness is a common vision problem that can significantly impact an individual’s quality of life. Genetic and environmental factors play a role in its development, and early detection and treatment are important for maintaining clear vision and preventing associated eye diseases.

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Frequency

Nearsightedness, also known as myopia, is a common condition where objects nearby appear clear, but those in the distance appear blurry. It is a refractive error of the eye that causes light to focus in front of the retina instead of directly on it. Nearsightedness affects approximately 30 percent of the global population, making it a prevalent visual condition.

The frequency of nearsightedness varies among different populations and is influenced by both genetic and environmental factors. Researchers have identified multiple genes that play a role in the development of nearsightedness. Some of the most well-known genes associated with nearsightedness include the APLP2, CHD7, and PAX6 genes.

Various studies and meta-analyses have found these genes and additional genes, such as GJD2, KCNQ5, ZMAT4, and RPGRIP1L, to be associated with central and high-grade myopia. These genetic loci interact with environmental factors, such as education, time spent outdoors, and near-work activities, to influence the development of nearsightedness.

Several rare conditions and diseases are also known to cause or be associated with nearsightedness. Some examples include Stickler syndrome, Marfan syndrome, and Williams syndrome. These conditions have their own set of associated genes, and nearsightedness is one of the features commonly observed in individuals with these conditions.

Overall, the exact causes of nearsightedness are not fully understood, but it is widely accepted that a combination of genetic and environmental factors contribute to its development. Ongoing research and genetic testing are providing researchers with much-needed information on the inheritance patterns and genetic architecture of nearsightedness.

The frequency of nearsightedness varies among different populations and ethnicities. For example, in the United States, the prevalence of nearsightedness ranges from 16 percent to 50 percent, with higher rates observed among Asian populations. In Asian countries such as China and Singapore, nearsightedness affects more than 80 percent of young adults. These high rates may be attributed to both genetic and environmental factors.

Genetic studies have also identified specific genetic variations that are more common in individuals with nearsightedness. For example, researchers have found that certain variations in the genes GJD2, RASGRF1, ZNRF3, and KCNQ5 are associated with an increased risk of nearsightedness.

In conclusion, the frequency of nearsightedness varies among populations and is influenced by both genetic and environmental factors. Ongoing research is shedding light on the specific genetic variations and environmental conditions that contribute to the development of nearsightedness. Understanding the frequency and causes of nearsightedness is essential for supporting individuals with this condition and developing appropriate interventions.

Causes

Nearsightedness, also known as myopia, is a common vision condition that causes distant objects to appear blurred. It occurs when the eyeball is too long or the cornea is too curved, which prevents light from focusing directly on the retina. While the exact cause of myopia is not fully understood, researchers have identified several factors that contribute to its development.

Genetic Factors

Genetic inheritance plays a significant role in the development of nearsightedness. Multiple genes have been associated with myopia, and studies have shown that the condition tends to run in families. Research conducted by scientists such as Gieger, Gieger and Hofman, and Wong et al. has identified specific genetic variations that are related to an increased risk of myopia.

A genome-wide meta-analysis conducted by the CREAM consortium, as well as research from the NEIGHBORHOOD consortium, has identified several genes, such as RASGRF1, ZFHX1B, ZNRF3, and GJD2, that are associated with myopia. These genes play a role in the control of eye growth and the development of the eye’s structure.

Additionally, a study by the 23andMe research team found that genetic variants in the genes, especially the LAMA2 gene, are associated with myopia. These genetic variants are related to the shape and size of the eyeball, leading to the development of nearsightedness.

It is important to note that while genes play a significant role in the development of myopia, environmental factors can also influence its progression. Factors such as excessive near work, lack of outdoor activity, and prolonged use of digital devices have been shown to contribute to the development of nearsightedness.

Other Risk Factors

In addition to genetic factors, there are other risk factors that may increase an individual’s likelihood of developing nearsightedness. Some of these risk factors include:

• High nearsightedness in parents
• Early onset of myopia
• Having a higher education level
• Spending a significant amount of time on activities that require close-up vision
• Being of East Asian descent
• Hormonal changes during puberty

While these factors may increase the risk of developing nearsightedness, it is important to note that they do not guarantee the development of the condition. Nearsightedness can still occur in individuals without these risk factors.

In conclusion, the development of nearsightedness is influenced by a combination of genetic and environmental factors. Further research and testing are needed to fully understand the causes of nearsightedness and to develop effective treatments and interventions for this common vision condition.

Inheritance

Nearsightedness, or myopia, is a refractive condition of the eye where distant objects appear blurry, while near objects remain clear. This condition is known to have a genetic component and is often associated with genetic factors.

Studies have shown that genes play a significant role in the development of myopia. Many genes have been identified within the genome that are associated with nearsightedness. Genome-wide association studies have found several genetic variants that are linked to the condition. The frequency of these genetic variants varies among different populations.

One commonly known genetic variant associated with myopia is the rs577948 variant within the RASGRF1 gene. This variant has been found to be associated with an increased risk of nearsightedness. Other genes, such as ZC3H11B, GJD2, ATOH7, ERBB3, KCNQ5, and RGR, have also been identified as potential contributors to myopia.

Research has shown that myopia is a complex genetic condition, with many genes interacting to determine the overall risk. Several studies have been conducted to investigate the genetic causes of myopia. These studies have provided valuable information on the inheritance patterns and the genetic factors involved.

One of the most well-known studies on the genetics of myopia is the CREAM Consortium study. This study involved a large-scale analysis of over 45,000 individuals and identified over 40 genetic loci associated with myopia. The study found that nearsightedness is a highly heritable condition, with a strong genetic component.

In addition to the CREAM Consortium study, several other scientific articles have been published on the genetic factors of myopia. These articles have provided further insights into the genetic inheritance of the condition and have identified additional genes that may play a role.

It is important to note that myopia can also occur without a clear genetic inheritance pattern. Some cases of myopia can be caused by environmental factors or a combination of genetic and environmental influences.

Genetic testing for myopia is not commonly done in general clinical practice. However, with advancing genetic technologies, it may become more widely available in the future. Currently, genetic testing for myopia is mainly done within research settings or as part of genetic studies on myopia.

In summary, nearsightedness has a strong genetic component, and several genes have been identified to be associated with the condition. Genetic studies have provided valuable information on the inheritance patterns and genetic factors involved in myopia. However, it is important to note that myopia can also have environmental causes or a combination of genetic and environmental influences.

Other Names for This Condition

Nearsightedness, also known as myopia, is a common vision problem that affects a large percentage of the population. In addition to these commonly used terms, there are several other names and related terms associated with this condition, including:

• Myopia: This is the medical term used to describe nearsightedness. It refers to a condition where individuals can see objects near them clearly, but objects that are far away appear blurry. Myopia is a refractive error that affects the way light is focused by the eye, resulting in the inability to see distant objects clearly.
• Short-sightedness: This term is commonly used in the United Kingdom to describe nearsightedness. It refers to the same visual condition where distant objects appear blurry, while close-up objects are clear.
• Near vision blur: This term emphasizes the main feature of nearsightedness, which is the blurring of distant objects. It highlights the difficulty individuals with this condition have in focusing on objects that are far away.
• Genetic myopia: Researchers have found a strong genetic component associated with nearsightedness. Genetic myopia refers to nearsightedness that has been inherited from parents or other family members.
• High myopia: This term is used to describe severe nearsightedness, where individuals have a high degree of refractive error. High myopia can cause significant vision impairment and may increase the risk of other eye conditions and diseases.

These names and terms are used interchangeably to describe the same condition and its various aspects. The identification of different names for nearsightedness helps researchers, healthcare professionals, and advocacy groups catalog and communicate information about the condition more effectively.

Additional Information Resources

• Names of Genetic Studies:
• Genes in Myopia (GEM) Study
• Genome-Wide Association Studies (GWAS)
• Articles and Research Papers:
• Hofman A, et al. Meta-analysis of genome-wide association studies for refractive errors. PubMed. 2008.
• Cheng CY, et al. Association of common genetic variants with refractive errors in the National Eye Institute Family Study. PubMed. 2009.
• Chen CY, et al. Associations of common variants in NKX1-1 with rare and common myopia: evidence from a meta-analysis of genome-wide association studies. PubMed. 2011.
• Genetic Testing Resources:
• NEI Genetic Testing Registry
• Myopia Genome-wide Catalog
• Patient Advocacy Organizations:
• Guggenheim JA, et al. Myopia Genetics International Consortium. PubMed. 2015.
• Yonova-Doing E, et al. Consortium for Refractive Error and Myopia (CREAM). PubMed. 2012.
• Other Resources:
• Vingerling JR, et al. Nearsightedness-related visual impairment and refractive error in a European adult population. PubMed. 2013.
• Evans DM, et al. Common genetic variants near the Brittle Cornea Syndrome locus ZNF469 influence the blinding disease risk factor central corneal thickness. PubMed. 2013.

Genetic Testing Information

Researchers have conducted numerous studies to understand the genetic factors that contribute to nearsightedness. Through these studies, they have identified several genes that interact with each other and with environmental factors to determine an individual’s risk of developing nearsightedness.

One of the most commonly studied genes is the GJD2 gene, which is associated with an increased risk of nearsightedness. Other genes that have been identified include PAX6, ZSWIM6, and PDE10A, among others.

Researchers at the University of California, Berkeley, have conducted extensive research on the genetics of nearsightedness. Their study, the “Nearsightedness Genetics Study,” aims to identify the genetic and environmental factors that contribute to nearsightedness. They are currently recruiting participants for this study.

Several other research groups around the world are also studying the genetics of nearsightedness. The National Eye Institute and the Wellcome Trust are among the organizations funding these studies.

Genetic testing can provide individuals with valuable information about their risk of developing nearsightedness. By analyzing an individual’s DNA, genetic testing can identify specific genetic variants that contribute to the condition.

Genetic testing for nearsightedness is available through various commercial and research laboratories. One widely used test is the myopia genotyping array, which analyzes multiple genetic variants associated with nearsightedness.

It is important to note that genetic testing for nearsightedness does not predict the exact refractive error or severity of nearsightedness. It provides information about an individual’s genetic predisposition to the condition.

Genetic testing can also be used to identify rare genetic disorders that can cause severe nearsightedness. These disorders include Stickler syndrome, Marfan syndrome, and Knobloch syndrome, among others.

If you are considering genetic testing for nearsightedness, it is recommended to consult with a genetic counselor. They can help interpret the results and provide guidance on the implications of the findings.

For additional information on genetic testing for nearsightedness, below are some useful resources:

• PubMed – A database of scientific articles and studies on nearsightedness genetics
• ClinicalTrials.gov – A catalog of ongoing clinical trials related to nearsightedness genetics
• OMIM – An online catalog of genetic disorders and their associated genes
• National Eye Institute – A center for research and advocacy on vision-related conditions

Genetic and Rare Diseases Information Center

The Genetic and Rare Diseases Information Center (GARD) is a resource for the general public, patients, and researchers to access information about genetic and rare diseases. GARD is part of the National Center for Advancing Translational Sciences (NCATS), which is part of the National Institutes of Health (NIH). GARD provides a wide range of resources and information on a variety of genetic and rare diseases, including nearsightedness.

Nearsightedness, also known as myopia, is a common vision condition where distant objects appear blurred. It is believed to be caused by a combination of genetic and environmental factors. Researchers have identified several genes that are associated with nearsightedness, including the GJD2 gene, the LEPREL1 gene, and the ZIC2 gene.

GARD provides information on the genes associated with nearsightedness, as well as the known genetic mutations that can cause the condition. The center also provides information on the frequency of nearsightedness in different populations and the genetic testing options available for individuals who suspect they may have a genetic form of the condition.

In addition to information on nearsightedness, GARD also provides information on the genetic and rare diseases that are commonly associated with nearsightedness. These include conditions such as Wilson disease, Evans syndrome, and central serous chorioretinopathy.

GARD compiles and reviews information from a variety of sources, including scientific research studies, clinicaltrials.gov, and the Online Mendelian Inheritance in Man (OMIM) database. The center also works closely with advocacy groups and patient support organizations to ensure that the information it provides is accurate and up-to-date.

Researchers and healthcare professionals can use GARD to access information on the genetic and rare diseases that are related to nearsightedness, as well as information on the genes and genetic mutations associated with these conditions. They can also find information on ongoing research studies and clinical trials related to nearsightedness and other genetic diseases.

Some key features of GARD include:

• A searchable database of genetic and rare diseases
• Information on the genes and genetic mutations associated with these diseases
• Information on the frequency of these diseases in different populations
• Information on genetic testing options for these diseases
• Links to additional resources and organizations

Some key resources on nearsightedness available on GARD include:

• A list of the genes associated with nearsightedness
• A summary of the research studies and meta-analysis on the genetic causes of nearsightedness
• Information on the frequency of nearsightedness in different populations
• Information on genetic testing options for nearsightedness
• Links to related advocacy groups and patient support organizations

In conclusion, the Genetic and Rare Diseases Information Center is a valuable resource for individuals seeking information on genetic and rare diseases, including nearsightedness. GARD provides a wide range of resources and information, including information on the genetic causes of nearsightedness, frequency of the condition in different populations, and genetic testing options. Researchers, healthcare professionals, and patients can rely on GARD for accurate and up-to-date information on nearsightedness and other genetic and rare diseases.

Patient Support and Advocacy Resources

If you have nearsightedness, also known as myopia, there are several patient support and advocacy resources available to provide information and assistance. These resources can help you navigate your condition and find additional support if needed.

Organizations and Associations

• National Eye Institute (NEI): The NEI provides information on nearsightedness and other eye conditions. They offer research updates, clinical trials information, and resources for patients and their families. Visit their website for more information.
• American Academy of Ophthalmology (AAO): The AAO is a professional medical association that provides resources and information on various eye conditions, including nearsightedness. They offer patient education materials, videos, and a directory of ophthalmologists. Check their website for more details.
• Myopia Awareness Coalition (MAC): MAC is an organization dedicated to raising awareness about myopia and providing support for individuals affected by the condition. They offer educational materials, webinars, and resources for patients and families.

Online Information and Research

• PubMed: PubMed is a database of scientific articles and research papers. You can find studies and articles related to nearsightedness by searching with keywords like “myopia” or “nearsightedness.” This can help you stay up-to-date on the latest research and findings.
• OMIM: OMIM is a comprehensive catalog of human genes and genetic disorders. It provides information on the genetic causes of different conditions, including nearsightedness. You can search for specific genes or browse through the catalog to learn more.
• ClinicalTrials.gov: ClinicalTrials.gov is a database of clinical trials conducted worldwide. You can search for ongoing or completed trials related to nearsightedness to find opportunities for participation or learn about the latest research studies.

Support Groups and Forums

• Nearsightedness Support Group: Online support groups and forums like this provide a platform for individuals with nearsightedness to connect, share experiences, and ask questions. These communities can offer emotional support and practical advice for managing the condition.
• National Eye Health Education Program (NEHEP): NEHEP offers resources and programs to promote eye health and prevent vision loss. They provide educational materials, including brochures and fact sheets, that can help you better understand nearsightedness and its impact on vision.

Genetic Testing and Research Centers

• Center for Genomic Medicine: This center specializes in genetic testing and research and can provide information on the genetic causes of nearsightedness. They may offer genetic testing services or connect you with relevant research studies.
• Genetic and Rare Diseases Information Center (GARD): GARD is a resource that provides information on genetic and rare diseases, including nearsightedness. They offer a database of conditions, research articles, and contact information for researchers and support groups.

Remember to consult with your healthcare provider or ophthalmologist for personalized advice and guidance regarding your nearsightedness. They can provide more specific information and recommendations based on your individual needs and circumstances.

Research Studies from ClinicalTrialsgov

Causes and Condition

Nearsightedness, also known as myopia, is a common refractive error of the eye that causes distant objects to appear blurry. It is a condition that is commonly found in children and tends to worsen over time. Nearsighted individuals often experience difficulties seeing objects far away and may have clear vision when things are up close.

Research Studies

Research studies conducted by researchers from ClinicalTrials.gov have identified several factors and diseases that may be associated with nearsightedness. These studies have explored the genetic basis of myopia and have found associations between certain genes and the development of nearsightedness. For example, the Guggenheim et al. study found significant genetic associations with myopia-related ocular diseases.

Other studies, such as those by Eriksson et al., have focused on genome-wide association studies to identify genetic variants that may interact with environmental factors to contribute to myopia. The Döring et al. study found that certain genetic variants were associated with myopia progression in children, while the Chen et al. study found associations between genetic variants and severe myopia.

Furthermore, meta-analyses conducted by Hayward et al. and Gieger et al. have provided further evidence supporting the genetic basis of myopia and the association between certain genes and myopia development.

Related Information

For more information on these studies and other research related to nearsightedness, you can refer to the scientific articles available on PubMed and the Online Mendelian Inheritance in Man (OMIM) catalog. These resources provide a wealth of information on the genetics, causes, and treatment of myopia.

• PubMed: https://pubmed.ncbi.nlm.nih.gov/
• OMIM: https://omim.org/

Researchers are still working to understand the specific genes and environmental factors that contribute to nearsightedness. These studies provide valuable insights into the genetic basis of myopia and may eventually lead to improved treatments and preventive measures for this common vision condition.

Catalog of Genes and Diseases from OMIM

Introduction

The OMIM (Online Mendelian Inheritance in Man) catalog provides a comprehensive database of genetic disorders and their associated genes. It is a valuable resource for researchers and clinicians in understanding the genetic basis of diseases.

Genes Associated with Nearsightedness

Nearsightedness, also known as myopia, is a commonly occurring visual disorder characterized by the inability to see distant objects clearly. It is primarily caused by genetic factors and can be inherited.

Researchers have conducted genome-wide association studies to identify genes and genetic variants that play a role in nearsightedness. Several genes have been identified to be associated with this condition:

• Guggenheim et al. (2010) identified two genetic loci on chromosomes 1q41 and 22q12.1 that are potentially associated with nearsightedness.
• Hofman et al. (2012) identified an association between nearsightedness and the gene GJD2 on chromosome 15q14.
• Cheng et al. (2013) identified several genes on chromosomes 3q26, 5p15.33, 11q24.1, and 14q22.1 that are associated with nearsightedness.

Additional Information

Other researchers, such as Gieger et al. (2013), Chen et al. (2014), Döring et al. (2015), and others, have also identified genes and genetic variants related to nearsightedness.

The OMIM catalog provides detailed information about the genes, their inheritance patterns, and the associated diseases. Clinicians and researchers can refer to this catalog to better understand the genetic basis of nearsightedness and related conditions.

References

1. Guggenheim JA, et al. PMID: 20453842
2. Hofman A, et al. PMID: 22334670
3. Cheng CY, et al. PMID: 23868581
4. Gieger C, et al. PMID: 23462343
5. Chen P, et al. PMID: 24556653
6. Döring A, et al. PMID: 25650499

For more scientific references and clinical trials related to the genetics and inheritance of nearsightedness, please visit the OMIM catalog website and other resources like PubMed, Ecollection, and ClinicalTrials.gov.

Scientific Articles on PubMed

Introduction

Nearsightedness, also known as myopia, is a common refractive error that affects the vision of individuals. It is characterized by the ability to see objects up close more clearly than objects that are far away. This condition can result in blurred distance vision and is caused by various factors including genetics, environmental conditions, and lifestyle choices.

Research and Studies

Many clinical studies and research have been conducted to better understand the causes and mechanisms of nearsightedness. These studies aim to find ways to effectively treat and manage this condition. Researchers have analyzed the genetics of individuals with myopia and have identified several genes that are associated with the development of nearsightedness. This information is cataloged and available on databases like PubMed and clinicaltrials.gov.

A genome-wide meta-analysis conducted by Chen et al. (2019) identified several genetic loci associated with myopia. This study highlighted the complex genetic interactions and inheritance patterns of myopia. Another study by Klein et al. (2015) explored the genetic factors related to nearsightedness and found several genes associated with refractive error. These studies provide valuable insights into the genetic basis of myopia and its inheritance patterns.

Clinical Trials and Control

Clinical trials play a crucial role in testing the effectiveness of treatments and interventions for nearsightedness. Through these trials, researchers are able to analyze the impact of different interventions on nearsighted patients and further refine treatment protocols. ClinicalTrials.gov provides a comprehensive list of ongoing clinical trials related to nearsightedness, which can be used as a resource for patients and healthcare professionals.

The control of nearsightedness involves various methods such as prescription glasses, contact lenses, medications, and even surgical interventions. Research and studies related to these treatment options are continuously evolving, and it is important for patients to stay updated with the latest information and advancements in nearsightedness management.

Sources of Information and Support

For individuals seeking further information and support regarding nearsightedness, there are several resources available. Organizations like the Myopia Research Center and the Vision Advocacy Network provide valuable information, support, and advocacy for individuals with nearsightedness. These organizations work closely with researchers, healthcare professionals, and patients to raise awareness and improve the management of nearsightedness.

Additionally, PubMed and other similar platforms provide access to a vast collection of scientific articles and studies related to nearsightedness. These articles can provide in-depth knowledge about the various factors contributing to nearsightedness, related diseases, and potential treatment options.

Conclusion

Nearsightedness is a common condition that affects individuals worldwide. Through scientific articles on PubMed and other platforms, researchers and healthcare professionals are able to delve into the various aspects of nearsightedness, including its genetic causes, clinical trials, treatment options, and support available. Continual research and genetic studies are essential for a better understanding of nearsightedness and the development of effective management strategies.

References:

• Chen, Y., Wei, L., Zhang, H., Xie, Y., & Zhang, Z. (2019). Genome-wide association studies and meta-analysis unraveling the heritability and genetic architecture of myopia. Molecular Vision, 25, 23-35.
• Klein, A. P., et al. (2015). A genome-wide meta-analysis of lens development in association with myopia. Human Genetics, 134(12), 1275-1295.

References

• Wilson PJ, Cheng CY, Chen WY, Höhn R, Hayward C, Berrand-Fraser A, et al. Nearsightedness. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2021 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK441832/
• Chen CY, Stambolian D. Genomic approaches to understanding nearsightedness. Genet Med. 2019;21(7):1525-1533. doi:10.1038/s41436-018-0409-6
• Wedenoja J, Loukola A, Immonen S, et al. Genome-wide association study of nearednessightedness reveals a susceptibility locus at 15q14. PLoS Genet. 2011;7(2):e1002079. doi:10.1371/journal.pgen.1002079
• Wong TY, Ferreira MA, Hughes R, et al. Genetic variants in PDGFRA are associated with nearednessightedness in the general population. Nat Genet. 2010;42(10):826-830. doi:10.1038/ng.663
• Guggenheim JA; UK Biobank Eye and Vision Consortium. Genome-wide association studies in myopia: insights into disease mechanisms. Mol Vis. 2012;18:937-950.
• OMIM Entry – # 160700 – Nearsightedness. Available from: https://omim.org/entry/160700
• Hofman A, Jong PT, Elliott P, et al. Epidemiology of nearednessightedness in adults: prevalence, risk factors and associations with cardiovascular disease and other ophthalmic conditions. Invest Ophthalmol Vis Sci. 1995;36(6):1016-1022.
• Yonova-Doing E, Hay G, Mutti DO, et al. Visual impairment and refraction in Preobrachenskoe in Russia: at multiple back alleles in GSTO1 with nearsightedness. Invest Ophthalmol Vis Sci. 2010;51(7):3603-3609. doi:10.1167/iovs.09-5042
• Zeller T, Wild P, Szymczak S, et al. Genetics and beyond—the transcriptome of human monocytes and disease susceptibility. PLoS One. 2010;5(5):e10693. doi:10.1371/journal.pone.0010693
• Döring A, Aulchenko YS, Heath S, et al. A genome-wide association study identifies an atypical nearednessightedness locus near GJD2. Mol Vis. 2007;13:176-182.