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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.
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 ...
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 ...
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 ...
Y. Yellowstone (steamboat) Categories: Steamboats of the United States. Steamboats by body of water. Missouri River. Hidden category: Commons category link is on Wikidata.
Subjective refraction. Subjective Refraction is a technique to determine the combination of lenses that will provide the best corrected visual acuity (BCVA). [1] It is a clinical examination used by orthoptists, optometrists and ophthalmologists to determine a patient's need for refractive correction, in the form of glasses or contact lenses.
With its unprecedented tear through the ultrawarm waters of the southeast Caribbean, Beryl turned meteorologists’ worst fears of a souped-up hurricane season into grim reality. Beryl hit Mexico ...
S. Saluda (steamship) Categories: Shipwrecks in rivers. Missouri River. Shipwrecks of the United States.