What does a visual acuity of 3 60 mean?
The 60 equates to the top line of letters on the Snellen chart, if you have to sit at 3 metres away from the chart to read the top line, this is recorded as 3/60. Each line of letters goes down in numerical value (distance) until it reaches 6/6 of normal visual acuity.
How do you read Snellen eye chart results?
Recording Snellen Results Top number equates to the distance (in metres) at which the test chart was presented (usually 6m), Bottom number identifies the position on the chart of the smallest line read by the ‘patient’. Eg; 6/60 means the subject can only see the top letter when viewed at 6m.
Is 2.5 eye prescription bad?
Generally, the further away from zero (+ or -), the worse the eyesight. A number between +/-. 025 to +/-2.00 is considered mild, a number between +/-2.25 to +/- 5.00 is considered moderate, and a number greater than +/- 5.00 is considered severe. Eye prescriptions can change over time.
What is 0.1 vision?
1 Moderate visual impairment. Visual acuity <= 0.3 > 0.1. 2 Severe visual impairment. Visual acuity <= 0.1 > 0.05. Blindness.
Are there different types of Snellen eye charts?
Other types of commonly used eye charts include the Landolt C, and the Lea test. Below you will find several variations of printable Snellen eye charts you can download and print for home use to determine your visual acuity ie. 20/20 vision.
What should my Snellen eye score be to drive a car?
In the United States, a score of 20/40 or better is required to drive a car without the use of corrective lenses. A vision scare of 20/200 (or worse) determines that an individual is legally blind. 2 There are several versions of the Snellen eye chart for people, such as young children, who cannot read the letters of the alphabet.
How is average acuity determined on a Snellen chart?
Thus, almost all normal eyes will equal or exceed the reference standard. If 20/20 equaled average acuity, half of the population would fall short of 20/20, since that is the definition of average. Visual acuity values are understood best by the following simple rule. On a Snellen chart we determine the line that the person can just recognize.
What should my vision be on an eye chart?
Eye charts can be configured in various ways. Generally, if you can read the big “E” at the top of the chart, but none of the letters lower than that, your vision is considered 20/200. 20/200 vision means that you can read a letter at 20 feet that people with “normal” vision could read at 200 feet. This means that your visual acuity is very poor.