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| blind spot |
a small area in the eye, where the optic nerve enters the retina, that is insensitive to light. [1/4 definitions] |
| colonoscopy |
examination of the colon with a flexible, fiber-optic instrument inserted into the rectum. |
| cranial nerve |
any of the twelve paired nerves, such as the optic and auditory nerves, that extend from the stem of the brain through openings in the skull. |
| endoscopic |
of or relating to the use of a flexible fiber-optic instrument to examine an inner part of the body. |
| lightwave |
of or pertaining to fiber-optic communication equipment. |
| optical |
of or concerning the science of sight and the properties of light; optic. [1/5 definitions] |
| photoreceptor |
a cell on a sense organ or nerve, such as the eye or the optic nerve, that detects light, or the organ or nerve itself. |
| retina |
the light-sensitive lining at the back of the inner eyeball that receives images and transfers them to the optic nerve. |
| retinitis pigmentosa |
an inherited, incurable disease of the eye in which the retina and optic nerve gradually deteriorate, resulting in total blindness. |
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