20/20 vision.. is not perfect vision?
Today we talk about how good 20/20 vision is.
The first number indicates the testing distance (20 feet) and the second number is the distance at which the smallest line of letters read on a vision chart subtends 5 minutes of arc.
Видео 20/20 vision.. is not perfect vision? канала Antonio the Optometrist
The first number indicates the testing distance (20 feet) and the second number is the distance at which the smallest line of letters read on a vision chart subtends 5 minutes of arc.
Видео 20/20 vision.. is not perfect vision? канала Antonio the Optometrist
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23 октября 2022 г. 16:25:42
00:09:27
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