Presbyopia Refractive Error
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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 refractive error ppt Funding Research at NEI Education Programs Training and Jobs Home > Eye Health Information > Refractive Errors > Facts About Presbyopia Facts About Presbyopia This information was developed by the National Eye Institute to help patients and their families search for general information about presbyopia. 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. Presbyopia Defined What is presbyopia? Presbyopia is a common type of vision disorder that occurs as you age. It is often referred to as the aging eye condition. Presbyopia results in the inability to focus up close, a problem associated with refraction in the eye. Can I have presbyopia and another type of refractive error at the same time? Yes. It is common to have presbyopia and another type of refractive error at the same time. There are several other types of refractive errors: myopia (nearsightedness), hyperopia (farsightedness), and astigmatism. An individual may have one type of refractive error in one eye and a different type of
care practitioner may prescribe eyeglasses or contact lenses. In contrast, someone with "emmetropia" has perfect vision with no refractive error. Emmetropes
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see clearly far away with no effort. Refractive Error There are three refractive error pdf types of refractive error: myopia, hyperopia, and astigmatism. Myopia or "nearsightedness". If you are myopic, you can see clearly presbyopia correction up close, but your distance vision is blurry. (In some areas, myopia is referred to as "hypermetropia." Hyperopia or "farsightedness". If you have hyperopia, you may be able to see https://nei.nih.gov/health/errors/presbyopia clearly at all distances, but you have to use extra focusing effort to do so, which can cause eyestrain, headaches, and intermittent blurred vision, especially up close. Hyperopia is often confused with presbyopia (see below), but farsightedness can exist with or without presbyopia. Astigmatism. If you have astigmatism, your vision is blurred or distorted at all distances. Many people who are nearsighted http://www.refractivesource.com/patients/ref_error_pres.htm or farsighted also have astigmatism. Presbyopia Presbyopia is the normal, age-related loss of ability to focus on things up close. It affects all of us once we reach our 40s. If you are already in your 40s or 50s, you know what presbyopia does. If you're younger and not yet presbyopic, one of the best ways to understand presbyopia is to consider what your vision is like when your eyes are dilated at the doctor's office. The dilating drops simulate presbyopia by relaxing your eyes' ability to focus (besides making your pupils large). If you wear eyeglasses to see clearly far away, put them on when your eyes are dilated. Then try reading. It'll be hard to focus, and this is what presbyopia is like! Presbyopia is due to age-related changes inside the eye, either within or around the crystalline lens. If you are presbyopic, your eyes will need at least two different prescriptions: one for far away, and one for up close. Current conventional refractive surgery procedures cannot correct presbyopia. If you have your refractive error (nearsightedness, farsightedness, and/or astigmatism) correct
中文 English Français Русский Español RSS Feed Youtube Twitter Facebook Google + iTunes Play Store What is a refractive error? Online Q&A 7 October 2013 Q: What is a http://www.who.int/features/qa/45/en/ refractive error? A: A refractive error is a very common eye disorder. It occurs when the eye cannot clearly focus the images from the outside world. The result of refractive errors is blurred vision, which is sometimes so severe that it causes visual impairment. The four most common refractive errors are: myopia (nearsightedness): difficulty in seeing distant objects clearly; hyperopia (farsightedness): difficulty refractive error in seeing close objects clearly; astigmatism: distorted vision resulting from an irregularly curved cornea, the clear covering of the eyeball. presbyopia: which leads to difficulty in reading or seeing at arm's length, it is linked to ageing and occurs almost universally. Refractive errors cannot be prevented, but they can be diagnosed by an eye examination and treated with corrective glasses, contact lenses presbyopia refractive error or refractive surgery. If corrected in time and by eye-care professionals, they do not impede the full development of good visual function. Correction is provided in different forms according to the defect, the age f the person, the requirements in terms of work of activity performed. WHO estimates that 153 million people worldwide live with visual impairment due to uncorrected refractive errors. This figure does not include the people living with uncorrected presbyopia, which is likely to be quite significant, according to some early evidence. WHO, its Member States and partners are working to find ways to provide good quality, professionally prescribed, local, affordable corrective refraction services to people in need, especially in poor areas with limited eye care services. Related links Refractive errors and low vision Prevention of avoidable blindness and visual impairment Share Email Twitter Facebook Google Delicious LinkedIn More... Print Question and answer archives Submit a question You are here: Features Online Q&A Quick Links Sitemap Home Health topics Data Media centre Publications Countries Programmes and projects Governance About WHO Help and Services Contacts FAQs Employment Feedback Privacy E-mail scams W