During an eye test, your optician will use a chart of letters ("eye chart") to measure how well you see objects at least 6 meters (20 feet) away. This is called distance visual acuity testing. The classic example of an eye chart is the Snellen eye chart, developed by Dutch eye docto...
EYE CHART meaning: a chart that has numbers and letters of different sizes and that is used for testing someone's vision
An eye chart for use in a treatment program that includes eye exercises comprises a peripheral line defining a geometric shape and a pair of intersecting lines within the area defined by the peripheral line. Spool-shaped images are superimposed on the peripheral line in a predetermined pattern and...
Illustration about Eye test chart. Poster for vision exam. Eye care test placard with latin letters. Vector. Illustration of myopia, exam, chart - 211947913
To use the Snellen chart, stand 20 feet away and read the rows of letters, starting at the top and working your way to the bottom. Do this while covering one eye and reading the chart with your uncovered eye. When you finish with one eye, restart the test with your other eye uncovere...
eye chart noun : a chart with rows of letters or objects of decreasing size that is read at a fixed distance for purposes of testing sight Medical Definition eye chart noun : a chart that is read at a fixed distance for purposes of testing sight especially : one with rows of let...
The method of the present invention comprises a vision test value related records to correctly identify a person by the eye chart on at least two letters, numbers, and graphics objects, and to compare the value of each eye patients. 由于这些符号是不同的,视敏度的记录值是准确的,并与每一次...
the same for all lines. some letters are easier to recognize than others. this may result in easier and more difficult lines. the difficulty of the letters used is taken into account. the average difficulty on each line is balanced. usually, only a single chart is used. this may lead to...
Did I miss the part where it says how the lady on the Clapham omnibus is supposed to know how to describe Thai Character Do Dek or Hebrew Letter Shin or is the chart only for linguists? When I have an eye test (about every 3 months), I just read off letters in the English alphabet...
The most common way to do this is using what's called a Snellen chart. The chart has larger letters or symbols at the top, and they get smaller as you move down the rows. When you think of having your eyes checked, the eye chart test may be the first thing that comes to mind. ...