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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 .
A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862 as a measurement tool for the acuity formula developed by his professor Franciscus Cornelius Donders .
Visual acuity with Near chart without correctors Visual acuity with eye chart at Near 15.7 inches (400 mm) and without (sc: Latin sine correctore) correctors (spectacles); Ncc is with (cc: Latin cum correctore) correctors. See Visual_acuity#Legal_definitions: VA OS Left visual acuity VA OD Right visual acuity VDU Visual display unit VF Visual field
To further understand the spiritual meaning of your right eye twitching, we spoke with Heather Amunet Archer, ... The phoenix is a symbol of perpetual creation, destruction and renewal. It also ...
Optotypes are represented as black symbols against a white background (i.e. at maximum contrast). The distance between the person's eyes and the testing chart is set so as to approximate "optical infinity" in the way the lens attempts to focus (far acuity), or at a defined reading distance (near acuity).
The Landolt C is an optotype that is used throughout most of the world as the standardized symbol for measuring visual acuity. It is identical to the "C" that is used in the traditional Snellen chart. [citation needed] In addition to this, the LEA symbols test has been experimentally verified to be both a valid and reliable measure of visual ...
The eye of the god Horus, a symbol of protection, now associated with the occult and Kemetism, as well as the Goth subculture. Eye of Providence (All-Seeing Eye, Eye of God) Catholic iconography, Masonic symbolism. The eye of God within a triangle, representing the Holy Trinity, and surrounded by holy light, representing His omniscience. Heptagram
A FBI document obtained by Wikileaks details the symbols and logos used by pedophiles to identify sexual preferences. According to the document members of pedophilic organizations use of ...