Mild Refractive Error
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Refractive Error In Children
Program Low Vision Education Program Spanish-language Education Program (¡Ojo con su visión!) Vision and Aging Program Training and Jobs All Training and Jobs NEI Summer Intern Program Diversity In Vision Research & Ophthalmology (DIVRO) Student Training Programs NEI Home About NEI Health Information News and Events Grants and Funding Research at NEI Education Programs Training and Jobs Home > Eye Health refractive error ppt Information > Refractive Errors > Facts About Refractive Errors Facts About Refractive Errors This information was developed by the National Eye Institute to help patients and their families search for general information about refractive errors. An eye care professional who has examined the patient’s eyes and is familiar with his or her medical history is the best person to answer specific questions. Refractive Errors Defined What are refractive errors? Refractive errors occur when the shape of the eye prevents light from focusing directly on the retina. The length of the eyeball (longer or shorter), changes in the shape of the cornea, or aging of the lens can cause refractive errors. What is refraction? Refraction is the bending of light as it passes through one object to another. Vision occurs when light rays are bent (refracted) as they pass through the cornea and the lens. The light is then focused on the retina. The retina converts the light-rays into messages that are sent through the optic nerve to the brain. The brain interprets these messages into the images we see. Frequently Asked Questions about Refractive Errors What are the different types of refractive errors? The most common types of refractive error
367.0-367.2-367.9 DiseasesDB 29645 MeSH D012030 [edit on Wikidata] Refractive error, also known as refraction error, is a problem with focusing of light on the retina due to the shape
Refractive Errors Pdf
of the eye.[1] The most common types of refractive error are near-sightedness,
Refractive Error Measurement
far-sightedness, astigmatism, and presbyopia. Near-sightedness results in far objects being blurry, far-sightedness result in close objects being refractive errors of the human eye blurry, astigmatism causes objects to appear stretched out or blurry, and presbyopia results in a poor ability to focus on close objects. Other symptoms may include double vision, headaches, https://nei.nih.gov/health/errors/errors and eye strain.[1] Near-sightedness is due to the length of the eyeball being too long, far-sightedness the eyeball too short, astigmatism the cornea being the wrong shape, and presbyopia aging of the lens of the eye such that it cannot change shape sufficiently. Some refractive errors are inherited from a person's parents. Diagnosis is by eye examination.[1] Refractive errors https://en.wikipedia.org/wiki/Refractive_error are corrected with eyeglasses, contact lenses, or surgery. Eyeglasses are the easiest and safest method of correction. Contact lenses can provide a wider field of vision; however are associated with a risk of infection. Refractive surgery permanently changes the shape of the cornea.[1] The number of people globally with refractive errors has been estimated at one to two billion. Rates vary between regions of the world with about 25% of Europeans and 80% of Asians affected.[2] Near-sightedness is the most common disorder.[3] Rates among adults are between 15-49% while rates among children are between 1.2-42%.[4] Far-sightedness more commonly affects young child and the elderly.[5][6] Presbyopia affects most people over the age of 35.[1] The number of people with refractive errors that have not been corrected was estimated at 660 million (10 per 100 people) in 2013.[7] Of these 9.5 million were blind due to the refractive error.[7] It is one of the most common causes of vision loss along with cataracts, macular degeneration, and vitamin A deficiency.[8] Contents 1 Classification 2 Risk facto
Tools Español You Are Here: Home → Health Topics → Refractive Errors URL of this page: https://medlineplus.gov/refractiveerrors.html Refractive Errors Also called: Farsightedness, Hyperopia, Myopia, Nearsightedness To use the sharing features on this page, please enable JavaScript. On https://medlineplus.gov/refractiveerrors.html this page Basics Summary Start Here Latest News Diagnosis and Tests Prevention and Risk http://www.merckmanuals.com/professional/eye-disorders/refractive-error/overview-of-refractive-error Factors Treatments and Therapies Learn More Related Issues Specifics Genetics See, Play and Learn Images Research Statistics and Research Clinical Trials Journal Articles Resources Reference Desk Find an Expert For You Children Patient Handouts Summary The cornea and lens of your eye helps you focus. Refractive errors are vision problems that happen when the shape of refractive error the eye keeps you from focusing well. The cause could be the length of the eyeball (longer or shorter), changes in the shape of the cornea, or aging of the lens. Four common refractive errors are Myopia, or nearsightedness - clear vision close up but blurry in the distance Hyperopia, or farsightedness - clear vision in the distance but blurry close up Presbyopia - inability to focus close up as mild refractive error a result of aging Astigmatism - focus problems caused by the cornea The most common symptom is blurred vision. Other symptoms may include double vision, haziness, glare or halos around bright lights, squinting, headaches, or eye strain. Glasses or contact lenses can usually correct refractive errors. Laser eye surgery may also be a possibility. NIH: National Eye Institute Start Here Facts about Astigmatism (National Eye Institute) Also in Spanish Facts about Hyperopia (National Eye Institute) Also in Spanish Facts about Myopia (National Eye Institute) Also in Spanish Facts about Presbyopia (National Eye Institute) Facts about Refractive Errors (National Eye Institute) Also in Spanish Refractive Errors (American Association for Pediatric Ophthalmology and Strabismus) Also in Spanish Latest News Undiagnosed Eye Problems Pose Risks for Migrant Farm Workers (10/10/2016, HealthDay) Diagnosis and Tests Dilating Eye Drops (American Association for Pediatric Ophthalmology and Strabismus) Also in Spanish Near Vision Test for Adults (Prevent Blindness America) Retinoscopy (American Association for Pediatric Ophthalmology and Strabismus) Also in Spanish Prevention and Risk Factors What Is a Comprehensive Dilated Eye Exam? (National Eye Institute) Also in Spanish Treatments and Therapies Cornea Transplant (Mayo Foundation for Medical Education and Research) MedlinePlus: Eye Wear (National Library of Medicine) Also in Spanish MedlinePlus: Laser Eye Surgery (National Library
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