Terminology

1. A lens having more than one focus
3. A condition where the eye's optic nerve is damaged due to increased pressure in eye.
5. A condition in which one can see near objects but cannot see far objects clearly.
6. a person who practices optometry.
8. A unit of refractive power that is equal to the reciprocal of the focal length (in meters) of a given lens.
10. A condition affecting the eye that causes clouding of the lens.
11. The part of the eye commonly known as the white.
12. optical device which focuses or disperses a light beam by means of refraction.
14. Progressive loss of near focusing ability of the eye due to ageing.

2. A type of refractive error due to rotational asymmetry in the eye's refractive power.
4. A vision condition in which nearby objects look blurred, but distant objects are more clearly visible.
6. a specialist in the branch of medicine concerned with the study and treatment of disorders and diseases of the eye.
7. (contact lens) having two different curves instead of one to correct both near and far sightedness
9. a pair of lenses set in a frame resting on the nose and ears, used to correct or assist defective eyesight or protect the eyes.
13. A test is performed as part of a normal examination of the eye to determine whether an individual has normal vision.