Corrective Lens - Lens Distance From Eye

Lens Distance From Eye

The overall size of the lens is controlled by how far the lens is positioned away from the eyes. A closer distance allows for a smaller lens, but there is a limit on how close eyeglass lenses in a frame can be to the eye, imposed by the eyelashes and eyelid.

Contact lenses placed directly on the cornea are physically larger than the pupillary region, and have a ring of extra unused material around the outer perimeter that simply helps to center the lens on the cornea.

Eyeglass lenses need to be larger the further away they are from the eye. Very large lenses in a double-bridge frame do not necessarily provide greater peripheral vision, due to the nose rest holding the lenses slightly further away from the eyes than with smaller lens frames.

Read more about this topic:  Corrective Lens

Famous quotes containing the words distance and/or eye:

    Letters to absence can a voice impart,
    And lend a tongue when distance gags the heart.
    Horace Walpole (1717–1797)

    Painting seems to be to the eye what dancing is to the limbs. When that has educated the frame to self-possession, to nimbleness, to grace, the steps of the dancing-master are better forgotten; so painting teaches me the splendor of color and the expression of form, and as I see many pictures and higher genius in the art, I see the boundless opulence of the pencil, the indifferency in which the artist stands free to choose out of the possible forms.
    Ralph Waldo Emerson (1803–1882)