The thin lense that's worn directly on the eyeballs are called contact lenses. They come in several different kinds, types and colors. The can now be used to correct astigmatism.
Eyeballs
Eyeballs are called eyeballs because they are an eye shaped as a ball. I'll look up why they're called "eyes" in a sec. -- I'm sorry, but no pages or internet sites talk about the origination of the word "eye". you can look it up in an encyclopedia if you want :(
They don't pierce eyeballs.
depending on the condition of the blindness, several procedures can be performed to improve eyesight. in some cases a corneal transplant can replace diseased/damaged cornea tissue which ultimately, can improve eyesight. one other procedure is for a stigmatism. this is called lasik surgery, where a high powered laser corrects vision in the eye hereby cancelling the stigmatism.
There aren't a lot of ways to improve eyesight - it mostly depends on your genetic make-up and how your eyes are designed. You can be sure that you eat right and get enough vitamins, because there are some vision problems caused by lack of certain vitamins. You can avoid harming your eyes by staying out of very bright lights and wearing sunglasses outside. You can avoid illegal drugs, many of which do harm your vision. Have regular physical check-ups at your doctor's, because some diseases can cause vision problems. Also, 60 to 120 mg of bilberry (also called huckleberry) daily has been shown to improve your night vision. You might also need eyeglasses, which are the best way to improve eyesight!
eyeballs
Carrots contain a substance called carotene which when digested produces vitamin A, which is essential for good eyesight.
The cavity behind the lens is called the vitreous chamber and is filled with a jelly-like substance called vitreous humor.
When a gas changes directly to a solid it is called deposition.
Sediments directly deposited by the glacier are called till.
It is called eyebrow piercing. There is no scientific or medical term other than the generic "body modification."
They have sharp,curved clavs called talons.their hooked beak help them to tear the flesh. they have veru good eyesight