Recently, I was having an eye exam and admitted to squinting my eyes to sharpen blurred edges. Later, while waiting for the dilation to set in, my brother (a would-be pharmacist fresh off an anatomy course) was telling me about how vision works.
As a non-scientist, here's as much as I gathered:
- The pupil allows light into our eyes.
- The lens bends and shifts to focus that light against our retina.
- The retina translates this light-information into signals via the optic nerve.
- Something about brains, and then sight!
So, my question is, if the lens being bent and shifted inside of our eye by muscles is how our eyes focus, why do those of us with poor vision squint? Surely it can't be that by narrowing my field of vision I'm consciously bending my lens.