Well you can get zero power lenses. Some people who don't have eyesight problems wear zero power lenses just for fashion. Most of the demo frames at shops have zero power lenses in them.
Studies show that your tongue is the strongest structure in your body. But only you know if your eye lens is the strongest because if you have strong eyesight then it is but if you have poor eyesight, like if you wear glasses,contacts,etc., then your eye lens is not the strongest structure in your body. You need to work your eyes constantly so that they can become the strongest structure in your body.
Yes
Cameras and glasses.
glasses
Please explain the question
His glasses have a concave lens.
No, you cannot change the bifocal prescription on glasses without changing the lens. The lens is what is prescribed by your eye doctor. The frame, however, can be changed.
Glasses are a plural form for glass (a drinking glass, or a lens). To indicate the plural of glasses (eyewear, a pair of eyeglasses), you would have to use the description "pairs of glasses."
glasses to see the puck
convex
Bifocals.
This part is called a Lens, on the camera and the glasses the are made of either optical glass or optical plastic, in the eye the lens in an organic material. Lens allow light to enter the camera, eye or glasses, and focuses that light on a surface such as the camera's film, the eye's retina, and the glasses wearer's eyes.