Difference between revisions of Visual acuity

(2 intermediate revisions by one other user not shown)

Line 1:

[[File:20-20novelgames.PNG|thumb|20/20 vision as diagnosed by [https://www.novelgames.com/en/eagleeye/ Eagle Eye on Novel Games]]]

Visual acuity (VA) is the measurement of how well the entire vision system can recognize what it sees. Formally, it is defined as the reciprocal of the smallest angle that the visual system can resolve.

Line 28:

Line 30:

which approaches 2, and we can be almost certain that if, with a good illumination, the acuity is only equal to 1, the eye presents defects sufficiently pronounced to be easily established.</blockquote>

==Reasons differing visual acuity==

==Reasons for differing visual acuity==

[[~~Refraction~~]] is only one ~~part~~ of visual acuity. Various medical conditions can cause physical blockage/dispersion of light in the eye, problems detecting light in the eye, or problems with the visual processing that turns a series of electrochemical signals into a picture in our mind's eye. See an [[optometrist]] if your vision can't be corrected with [[refraction]].

Non-zero [[refractive state]], which causes [[blur]] and [[double vision]], is only one factor of visual acuity. Various medical conditions can cause physical blockage/dispersion of light in the eye, problems detecting light in the eye, or problems with the visual processing that turns a series of electrochemical signals into a picture in our mind's eye. See an [[optometrist]] if your vision can't be corrected with [[refraction]].

==20/x==

@@ Line 1: / Line 1: @@
+[[File:20-20novelgames.PNG|thumb|20/20 vision as diagnosed by [https://www.novelgames.com/en/eagleeye/ Eagle Eye on Novel Games]]]
 Visual acuity (VA) is the measurement of how well the entire vision system can recognize what it sees. Formally, it is defined as the reciprocal of the smallest angle that the visual system can resolve.
@@ Line 28: / Line 30: @@
 which approaches 2, and we can be almost certain that if, with a good illumination, the acuity is only equal to 1, the eye presents defects sufficiently pronounced to be easily established.</blockquote>
-==Reasons differing visual acuity==
+==Reasons for differing visual acuity==
-[[Refraction]] is only one part of visual acuity.  Various medical conditions can cause physical blockage/dispersion of light in the eye, problems detecting light in the eye, or problems with the visual processing that turns a series of electrochemical signals into a picture in our mind's eye.  See an [[optometrist]] if your vision can't be corrected with [[refraction]].
+Non-zero [[refractive state]], which causes [[blur]] and [[double vision]], is only one factor of visual acuity.  Various medical conditions can cause physical blockage/dispersion of light in the eye, problems detecting light in the eye, or problems with the visual processing that turns a series of electrochemical signals into a picture in our mind's eye.  See an [[optometrist]] if your vision can't be corrected with [[refraction]].
 ==20/x==