what is the function of the lens
The lens, like the lens of a camera, opens and shuts to allow light to reach the retina to focus an image. With age, the lens loses the function to refract light to bring images into focus. Disease can rob the lens of its function to work with light. Many conditions can be corrected with surgery.
The function of a condenser lens is to focus the light onto a specimen. Condenser lenses are most useful at the highest powers of 400 x and above. Microscopes with a condenser â¦ lens render a sharper image than those with no lens.
back toric contact lens A contact lens used to correct corneal astigmatism in which the surface of the lens facing the cornea is not spherical but toroidal in order to obtain a good physical fit on the cornea. To create better stability of the lens on the eye it usually incorporates a prism ballast. See ballast.