why do you see better when you squint?

Question

And why is squinting bad for your eyes if it helps you see better?

In: 73

Answer 1

The opening of the eye is contracted because of the narrow gap and eyelashes. This limits the possible angles that light can enter the eye from. A small hole would render an image sharp, but only lets in a small amount of light which is not useful in dim conditions. The eyeball may also get slightly squished thus correcting the defect where the lens focuses in front of back wall of the eye where the sensors are.