1 doctor weighed in:
How did people deal with impaired vision before glasses?
1 doctor weighed in

Dr. Jeffrey Gold
Ophthalmology
In brief: Squinting
They squinted a lot! the purpose of the front of the eye (the cornea and the lens) is to bend or refract light rays so they will be properly focused on the retina.
By squinting the eyelids block out most of the peripheral light rays that would have to be focused the most and only let in the central light rays that will hit the retina properly without focusing.

In brief: Squinting
They squinted a lot! the purpose of the front of the eye (the cornea and the lens) is to bend or refract light rays so they will be properly focused on the retina.
By squinting the eyelids block out most of the peripheral light rays that would have to be focused the most and only let in the central light rays that will hit the retina properly without focusing.
Dr. Jeffrey Gold
Dr. Jeffrey Gold
Thank
Get help from a real doctor now
Dr. Peter Kurzweil
Board Certified,
46 years in practice
16M people helped
Continue
107,000 doctors available
Read more answers from doctors