Error Refraction Symptoms
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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 this
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page Basics Summary Start Here Latest News Diagnosis and Tests Prevention and Risk Factors an error of refraction medical term Treatments and Therapies Learn More Related Issues Specifics Genetics See, Play and Learn Images Research Statistics and Research Clinical Trials Journal Articles refractive error treatment 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 the eye
Types Refractive Errors
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 a result of
Refractive Errors Ppt
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 of Medicine) Also in Spanish Phakic Intr
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Refractive Error In Children
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Care Sub-Section Eye Clinics Make an Appointment How to Find Us Eye Conditions Find a Doctor Navigation: Eye Conditions Eye Conditions Video Library FAQ "Ask the Expert" Ophthalmology Links Search the Kellogg http://kellogg.umich.edu/patientcare/conditions/refractive.errors.html website Navigation: Breadcrumbs Home Patient Care Eye Conditions Refractive Errors Refractive Errors Reviewed https://nei.nih.gov/health/errors/errors by Jill E. Bixler, M.D. On this page: What Is a Refractive Error? Symptoms Causes Risk Factors Tests and Diagnosis Treatment and Drugs Clinic Information What Is a Refractive Error? Refractive error means that the shape of your eye does not bend light correctly, resulting in a blurred image. refractive error The main types of refractive errors are myopia (nearsightedness), hyperopia (farsightedness), presbyopia (loss of near vision with age), and astigmatism. Symptoms Blurred vision Difficulty reading or seeing up close Crossing of the eyes in children (esotropia) Causes Overuse of the eyes does not cause or worsen refractive error. The causes of the main types of refractive error are described below: Myopia(close objects are error of refraction clear, and distant objects are blurry) Also known as nearsightedness, myopia is usually inherited and often discovered in childhood. Myopia often progresses throughout the teenage years when the body is growing rapidly. Watch a video explaining myopia. Hyperopia (close objects are more blurry than distant objects) Also known as farsightedness, hyperopia can also be inherited. Children often have hyperopia, which may lessen in adulthood. In mild hyperopia, distance vision is clear while near vision is blurry. In more advanced hyperopia, vision can be blurred at all distances. Watch a video explaining hyperopia. Presbyopia (aging of the lens in the eye) After age 40, the lens of the eye becomes more rigid and does not flex as easily. As a result, the eye loses its focusing ability and it becomes more difficult to read at close range. This normal aging process of the lens can also be combined with myopia, hyperopia or astigmatism. Watch a video explaining presbyopia. Astigmatism Astigmatism usually occurs when the front surface of the eye, the cornea, has an asymmetric curvature. Normally the cornea is smooth and equally curved in all direc
to the NEI Health Information Eye Health Topics Clinical Studies Publications Catalog Photos and Images Spanish Language Information News and Events All News Meetings and Events Grants and Funding All Grants and Funding Division of Extramural Activities Division of Extramural Science Programs Funding Opportunity Announcements Funding Mechanisms Supported by the NEI Research at NEI All Research at NEI Office of the Scientific Director Office of the Clinical Director Education Programs All Education National Eye Health Education Program Diabetic Eye Disease Education Program Glaucoma Education 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 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 er