Why I can see more clearly when I look through tiny hole?!
Question:
Why I can see more clearly when I look through tiny hole?
I have minus 4 on my eyes but when I look through tiny hole from thumb and index finger I can see more clearly even without my glass. How could it be?
Answers:
When a lens bends light, like a magnifying lens bending sunlight to a small dot to make a campfire....some of the light rays bend a lot, and the ones in the center of the lens don't bend hardly any. By looking through a small opening, you are using the undeviated light rays or the minimally deviated ones that go pretty much straight through the lens.
This is the basis of the pinhole glasses one sees in Sports Magazines where anyone can wear these glasses and see without having to go to their doctor and spend money on an exam, then getting frames and lenses and coatings and.....That's the type of ad. You think you've got headaches now? They do work if nothing else is around, but squinting will do the same.
If you want a more detailed explanation, let me know. Perhaps an optometrist,(Who are MASTERS at refraction, refractive errors, ways to correct these disorders, contact lenses and that stuff...) might want to explain this.