Error Of Refraction
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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 3 types of refractive errors features on this page, please enable JavaScript. On this page Basics Summary what is considered a high refractive error Start Here Latest News Diagnosis and Tests Prevention and Risk Factors Treatments and Therapies Learn More Related Issues Specifics inflammation of the cornea 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 https://nei.nih.gov/health/errors/errors of your eye helps you focus. Refractive errors are vision problems that happen when the shape of 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 https://medlineplus.gov/refractiveerrors.html 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 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 a
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 http://kellogg.umich.edu/patientcare/conditions/refractive.errors.html Links Search the Kellogg website Navigation: Breadcrumbs Home Patient Care Eye Conditions Refractive Errors Refractive Errors Reviewed by Jill E. Bixler, M.D. On this page: What Is a Refractive http://patient.info/doctor/refraction-and-refractive-errors 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 refractive error not bend light correctly, resulting in a blurred image. 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 error of refraction causes of the main types of refractive error are described below: Myopia(close objects are 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. Astigmati
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