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Landolt C. Lea test. logMAR chart. 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. [ 1] Eye charts are often used by health care professionals, such as optometrists, physicians and nurses, to screen persons for vision impairment.
In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres. At this distance, the symbols on the line representing "normal" acuity subtend an angle of five minutes of arc, and the thickness of the lines and of the spaces between the lines subtends one minute of arc. This line, designated 6/6 (or 20/20), is the ...
Eye examination for visual acuity. Visual acuity is a measure of the spatial resolution of the visual processing system. VA, as it is sometimes referred to by optical professionals, is tested by requiring the person whose vision is being tested to identify so-called optotypes – stylized letters, Landolt rings, pediatric symbols, symbols for the illiterate, standardized Cyrillic letters in ...
The MNREAD acuity chart or Minnesota low vision reading chart is a text based chart used to measure near visual acuity in people with normal or low vision. [1] It can also be used to measure maximum reading speed, critical print size and the reading accessibility index of a person. [2] Digital and printed types of charts are available.
A good procedure is a chart, analogous to the familiar Snellen visual acuity chart, in which one letter in each row differs in depth (front or behind) sequentially increasing in difficulty. For children the fly test is ideal: the image of a fly is transilluminated by polarized light; wearing polarizing glasses the wing appears at a different ...
River tubing — both inexpensive and family-friendly — has become a popular summer pastime in the United States, and USA TODAY 10Best is on the hunt for America's best tubing rivers.
The latest study estimated that it would cost up to $221 million to extend the streetcar from the River Market north to downtown North Kansas City. A NorthRail Streetcar Study fact sheet can be ...
The Chariton River is a 218-mile-long (351 km) [3] tributary to the Missouri River in southeast Iowa and northeast Missouri. The river forms in southeastern Clarke County, Iowa . It is dammed at 11,000-acre (45 km 2 ) Rathbun Reservoir in Appanoose County, Iowa and then flows 30 miles (48 km) before entering Missouri where it forms the boundary ...