The lenses have different responsibilities. A optic lens is often concave which means it fold inward. An anatomy lens is mostly convex which means it folds outwards. Both lens' help you see.
In optics, a thin lens is a lens with a thickness (distance along the optical axis between the two surfaces of the lens) that is negligible compared to the focal length of the lens. Lenses whose thickness is not negligible are sometimes called thick lenses.
W. A. Douthwaite has written: 'Contact lens optics and lens design' -- subject(s): Contact lenses, Optics, Physiological optics 'Contact lens optics' -- subject(s): Contact lenses, Optics, Physiological optics
"Lense" is a misspelling of "lens," which is the correct spelling referring to a curved piece of glass or other transparent material that focuses or disperses light rays.
There is none
They use optics
the name
Both use the principle of optics.
The lens size is the only difference the XL have a bigger lens.
The diffrence between thick and thin lens depends on your precription for your eyes.
no need to wear goggles
one is single lens and the other is multi lens
An eyelid for me and thee, or a lenscap for various glass optics.