As The Verge explains in the video below, eye charts measure one aspect of healthy vision: ... A perfect 20/20 score on an eye chart test doesn't mean you have perfect vision: Visual acuity, ...

The acuity measurement is done 20 feet away from the chart and the test is done with each eye separately. Most digital or electronic eye charts are based on a similar principle.

At least once in your life, you must have squinted at the eye chart at the doctor’s office or DMV, trying to make out the blurry bottom line. Turns out, there’s some very precise math that ...

In his famous eye chart, each row represents a different dioptre, which measures the distance you would have to be from the text to read it. Monoyer also inserted his name into the chart.

The difference ‘c’ between the x and y co-ordinates of the centre of the chart and eye ‘a ... quantifying the effect of movement on visual acuity measurement. Eye 29, 129–135 (2015). https ...

Eye - Performance of a computerised visual acuity measurement device in subjects with age-related macular degeneration: comparison with gold standard ETDRS chart measurements Skip to main content ...