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| optical |
of or having to do with the sense of sight or the eye. [1/2 definitions] |
| pupil2 |
the small, dark opening in the center of the eye. Light passes through the pupil into the eye. |
| retina |
the part of the eye at the back of the inside of the eyeball. The retina has cells that sense light and color. Images are formed on the retina and sent to the brain. |
| tear1 |
a drop of salty liquid that comes from the eye. Tears clean the eye and keep it wet. [1/2 definitions] |
| wink |
to close and open one eye quickly, as a sign of agreement or friendliness. [1/5 definitions] |
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