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A Snellen chart is an eye chart that can be used to measure visual acuity by reading letters of different sizes. The chart is named after Herman Snellen, who developed it in 1862, and it is used to express vision as a fraction, such as 6/6 or 20/20.
An eye chart is a chart used to measure visual acuity comprising lines of optotypes in ranges of sizes. Optotypes are the letters or symbols shown on an eye chart. Learn about the history, types, and procedure of eye charts.
This web page provides a comprehensive list of abbreviations used by optometrists to denote various clinical conditions, examination techniques and findings, and treatment methods. The term "ou eye" is not included in the list, but it may refer to the oculus uterque (both eyes) abbreviation.
Visual acuity is the clarity of vision and the ability to recognize small details. It is measured by optotypes on a chart and expressed as a fraction, such as 6/6 or 20/20, which means the distance at which a person with normal vision can see the same optotype.
A comprehensive list of ophthalmic instruments with their uses and functions, such as spectacles, contact lenses, tonometers, speculum, needle holders, forceps, diamond knife, etc. The list also includes some instruments for lacrimal surgery, bone fracture, and evisceration.
An eye examination is a series of tests performed to assess vision and ability to focus on and discern objects. It also includes other tests and examinations pertaining to the eyes, such as refraction, pupil function, ocular motility, visual fields, and ophthalmoscopy.
In the test, the person looks with each eye separately at the small dot in the center of the grid. Patients with macular disease may see wavy lines or some lines may be missing. Amsler grids are supplied by ophthalmologists, optometrists or from web sites, and may be used to test one's vision at home. The original Amsler grid was black and white.
Netherlands Hospital for Eye Patients Typical Snellen chart to estimate visual acuity Herman Snellen ( Dutch pronunciation: [ˈɦɛrmɑn ˈsnɛlə(n)] , February 19, 1834 – January 18, 1908) was a Dutch ophthalmologist who in 1862 introduced the Snellen chart to study visual acuity .
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