double vision refractive error
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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 website Navigation: Breadcrumbs Home Patient Care Eye Conditions Diplopia Diplopia (Double Vision) Reviewed by Lindsey B.
Refractive Error AstigmatismDe Lott, M.D. On this page: What Is Diplopia? Symptoms Causes Risk Factors Tests and refractive error pdf Diagnosis Treatment and Drugs Clinic Information What Is Diplopia? Diplopia, or double vision, is a condition where a single object is seen in duplicate.
Refractive Error TreatmentDouble and blurred vision are often thought to be the same, but they are not. In blurred vision, a single image seen by one eye appears unclear. Symptoms Eyes wander or appear "crossed" or misaligned Double vision The symptoms https://nei.nih.gov/health/errors/errors described above may not necessarily mean that you have diplopia. However, if you experience one or more of these symptoms, contact your ophthalmologist for a complete exam. Causes Diplopia may be the result of a refractive error, where light from an object is split into two images by a defect in your eye's optical system. Cataracts might, for example, cause such a defect. Diplopia also may result from failure of both eyes to point at the object being http://kellogg.umich.edu/patientcare/conditions/diplopia.html viewed, a condition referred to as ocular misalignment. In normal vision, both eyes look at the same object. The images seen by both eyes are fused into a single picture by the brain. If your eyes do not point at the same object, the image seen by each eye is different and cannot be fused. This results in double vision. Risk Factors There are many causes of diplopia and risk factors depend on the underlying cause. Tests and Diagnosis A complete eye exam is necessary to determine the cause of diplopia. This includes a complete medical history, assessment of visual acuity, eye motility, and evaluation for ocular misalignment. Additional testing, such as MRI or CT scan and blood tests, may be necessary depending on the cause of diplopia. Treatment and Drugs Treatment of double vision depends on the underlying cause and may consist of eye patching, prisms, eye exercises, surgical straightening of the eye, or a combination of these options. Therapy is aimed at realigning the misaligned eye where possible without surgery and restimulating the part of the visual pathway to the brain that is not working correctly. Certain rare causes of diplopia may be treated with medication. Your ophthalmologist will decide if your type of diplopia is likely to respond to medicine. Clinic Information For more information, see the Neuro-Ophthalmology Clinic and the complete Clinic Services listing of the U-M Kel
often are the main reason a person seeks the services of an optometrist or ophthalmologist. But what does it really mean when we're told that our vision is blurry because we have a refractive error? http://www.allaboutvision.com/eye-exam/refraction.htm We see the world around us because of the way our eyes bend (refract) light. Refractive errors are optical imperfections that prevent the eye from properly focusing light, causing blurred vision. The primary refractive errors are nearsightedness, https://en.wikipedia.org/wiki/Refractive_error farsightedness and astigmatism. Refractive errors usually can be "corrected" with eyeglasses or contact lenses, or they can be permanently treated with LASIK and other vision correction surgery (also called refractive surgery). FIND A DOCTOR: Do you have refractive error a refractive error? Find an eye doctor near you to have your eyes checked. > How Light Travels Through the Eye In order to see, we must have light. While we don't fully understand all the different properties of light, we do have an idea of how light travels. Watch this video on what causes blurry vision and how we can correct it. A light ray can be deflected, reflected, bent or absorbed, depending double vision refractive on the different substances it encounters. When light travels through water or a lens, for example, its path is bent or refracted. Certain eye structures have refractive properties similar to water or lenses and can bend light rays into a precise point of focus essential for sharp vision. Most refraction in the eye occurs when light rays travel through the curved, clear front surface of the eye (cornea). The eye's natural (crystalline) lens also bends light rays. Even the eye's tear film and internal fluids (aqueous humor and vitreous) have refractive abilities. Recommended For You Pay for your family's vision care with a CareCredit credit card Learn how Optometry Giving Sight helps 670 million people to see again Questions about cataracts? Find all the answers in My Cataract Journey Save 10-30% off your eye exam using the BenefitsPal™ card How the Eye Sees The process of vision begins when light rays that reflect off objects and travel through the eye's optical system are refracted and focused into a point of sharp focus. For good vision, this focus point must be on the retina. The retina is the tissue that lines the inside of the back of the eye, where light-sensitive cells (photoreceptors) capture images in much the same way that film in a camera does when exposed to light. These
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 of the eye. The most common types of refractive error are near-sightedness, far-sightedness, astigmatism, and presbyopia. Near-sightedness results in far objects 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 focus on close objects. Other symptoms may include double vision, headaches, and eye strain. 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. 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. 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. Near-sightedness is the most common disorder. Rates among adults are between 15-49% while rates among children are between 1.2-42%. Far-sightedness more commonly affects young child and the elderly. Presbyopia affects most people over the age of 35. The number of people with refractive errors that have not been corrected was estimated at 660 million (10 per 100 people) in 2013. Of these 9.5 million were blind due to the refractive error. It is one of the most common causes of vision loss along with cataracts, macular degeneration, and vitamin A deficiency. Contents 1 Classification 2 Risk factors 2.1 Genetics 2.2 Environmental 3 Diagnosis 4 Management 5 Epidemiology 6 References 7 External links Classification An eye that has no refractive error when viewing distant objects is said to have emmetropia or be emmetropic meaning the eye is in a state in which it can focus parallel rays of