Correction Of Refractive Error
Contents |
to the NEI Health Information Eye Health Topics Clinical Studies Publications Catalog Photos and Images Spanish Language Information News and Events refractive error correction surgery All News Meetings and Events Grants and Funding All Grants and Funding Division refractive error symptoms of Extramural Activities Division of Extramural Science Programs Funding Opportunity Announcements Funding Mechanisms Supported by the NEI Research at NEI
Refractive Error In Children
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
Refractive Error Treatment
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 how to correct refractive error naturally > 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 errors are myopia, hyperopia, presbyopia, and astigmatism. Myopia (nearsight
Uveitis Focus On Pediatric Ophthalmology Education Center Oculofacial Plastic Surgery Center Laser Surgery Education Center Redmond Ethics Center Global Ophthalmology Guide Academy Publications EyeNet
Refractive Error Ppt
Ophthalmology Information for: International Ophthalmologists Media Medical Students types refractive errors Patients and Public Technicians and Nurses Senior Ophthalmologists Young Ophthalmologists Tools and Services normal eyes free of refractive errors are called Academy Forum EyeCare America Help IRIS Registry Meetings and Deadlines Ophthalmology Job Center Our Sites EyeWiki International Society of Refractive https://nei.nih.gov/health/errors/errors Surgery Museum of Vision Subspecialties Cataract/Anterior Segment Comprehensive Ophthalmology Cornea/External Disease Glaucoma Neuro-Ophthalmology/Orbit Pediatric Ophthalmology/Strabismus Ocular Pathology/Oncology Oculoplastics/Orbit Refractive Management/Intervention Retina/Vitreous Uveitis Focus On Pediatric Ophthalmology Education Center Oculofacial Plastic Surgery Center Laser Surgery Education Center Redmond Ethics Center Global Ophthalmology http://www.aao.org/eye-health/treatments/what-is-refractive-surgery Guide Find an Ophthalmologist Advanced Search Annual Meeting Clinical Education Practice Management Member Services Advocacy Foundation About Subspecialties & More Eye Health Home Annual Meeting Clinical Education Practice Management Member Services Advocacy Foundation About Subspecialties & More Academy Publications EyeNet Ophthalmology Information for: International Ophthalmologists Media Medical Students Patients and Public Technicians and Nurses Senior Ophthalmologists Young Ophthalmologists Tools and Services Academy Forum EyeCare America Help IRIS Registry Meetings and Deadlines Ophthalmology Job Center Our Sites EyeWiki International Society of Refractive Surgery Museum of Vision Subspecialties Cataract/Anterior Segment Comprehensive Ophthalmology Cornea/External Disease Glaucoma Neuro-Ophthalmology/Orbit Pediatric Ophthalmology/Strabismus Ocular Pathology/Oncology Oculoplastics/Orbit Refractive Management/Intervention Retina/Vitreous Uveitis Focus On Pediatric Ophthalmology Education Center Oculofacial Plastic Surgery Center Laser Surgery Education Center Redmond Ethics Center Global Ophtha
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 https://en.wikipedia.org/wiki/Refractive_error retina due to the shape of the eye.[1] The most common types of refractive error are near-sightedness, far-sightedness, astigmatism, and presbyopia. Near-sightedness results in far objects http://www.who.int/features/qa/45/en/ being blurry, far-sightedness result in close objects being blurry, astigmatism causes objects to appear stretched out or blurry, and presbyopia results in a poor ability to refractive error focus on close objects. Other symptoms may include double vision, headaches, 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 of refractive error sufficiently. Some refractive errors are inherited from a person's parents. Diagnosis is by eye examination.[1] Refractive errors 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
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 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 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 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 F