Yes, usually, that is the case. Evolutionarily, our bodies are not really "built" to survive and function optimally much past age 40. But since modern medicine and technology often provide us with a lifespan almost twice that, we have to deal with our various body parts...
The "index of refraction" is a term in optics referring to how much a lens material bends (refracts) light going through it. For example, air does not bend light as much as water does -something readily apparent to us when we see a pole sticking...
So many people tell me their vision is so bad they are "legally blind." Almost all of them have a glasses Rx less than ¼ of yours! LASIK is definitely not the solution for you no matter how healthy your cornea may be. If you have otherwise healthy...
Presbyopia has been frustrating people for thousands of years, causing sharpness of near objects to blur. As the eyes age, presbyopia worsens and that has inspired inventors throughout the ages to get creative for the ultimate fix. Bifocal types have evolved, from the originals (celebrated by...
No. the conjunctiva is the thin, moveable, and semi-transparent layer that covers the white part of the eye (the sclera). It does not extend past the edge of the cornea (the limbus). The iris sits a little behind the cornea. The conjunctiva only extends the...
