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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 Snellen chart is an eye chart that can be used to measure visual acuity by reading letters of different sizes. Learn about the history, description, and variation of Snellen charts, and how they are used to express visual acuity as fractions or ratios.
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.
Visual impairment is the partial or total inability of visual perception, which may be caused by various conditions or problems in the eye or brain. Learn about the symptoms, complications, treatment, and prevalence of visual impairment, as well as the different categories and definitions used by WHO and other countries.
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A LogMAR chart is a chart of letters used to estimate visual acuity, with each letter having a score value of 0.02 log units. The chart was designed to enable more accurate estimates than other charts, such as the Snellen chart, and has a standardized test task.
Near visual acuity or near vision is a measure of how clearly a person can see nearby small objects or letters.Visual acuity in general usually refers clarity of distance vision, and is measured using eye charts like Snellen chart, LogMAR chart etc. Near vision is usually measured and recorded using a printed hand-held card containing different sized paragraphs, words, letters or symbols.
Learn about the anatomy and physiology of the human eye, a sensory organ that reacts to visible light and allows eyesight. The eye is composed of several layers, including the cornea, iris, lens, retina, and sclera, that work together to focus and process images.