Acuity test: Landolt rings & Snellen Chart
Landolt ring chart
Snellen Chart
Acuity Test:
Visual acuity is a criterion for vision quality, and corresponds to the power of the eye to
distinguish detail.
The Depisteo Vision Screener (VT1) uses several different visual acuity charts that:
· Vary the optotypes so as to avoid voluntary or involuntary memorization
· Test illiterate persons
· Test morphoscopic vision (recognition of shapes)
· Test the power of separation (recognition of a detail)
Different charts test binocular and monocular vision.
The choice of symbols, as well as their morphology, are rigorously defined to increase the
efficacy of optotype identification.
An acuity test, or chart, contains 7 levels of visual acuity (7 lines)
A level of visual acuity is represented by 6 distinct optotypes regrouped on the same line.
The different levels of acuity presented constitute the acuity scale.
A level of visual acuity is validated as soon as 4 of the 6 optotypes of this acuity are
correctly identified.
Including Purdue Job Standards Pre-settings
Depisteo VT1 "Occupational health Edition"
