Not only eye's health, and is restricted in the normal vision and the color discrimination and the scotopia, moreover also includes often the stereo perception which is neglected by the human.
And for the first time, some blind people are getting office jobs using tech like Braille typewriters so they can work alongside sighted people as equals.
If you were standing at 20 feet from the eye chart, the person with normal vision would only be able to see what you see if they stood closer at 15 feet to the eye chart.