| OPT | the crossing of the optic nerves from the two eyes at the base of the brain |
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| OPT | the crossing of the optic nerves from the two eyes at the base of the brain |
| OPT | (embryology) a two-walled cuplike depression that develops into the pigmented and sensory layers of the retina |
| OPT | the point where the optic nerve enters the retina |
| OPT | the point where the optic nerve enters the retina |
| OPT | serves the retina |
| OPT | serves the retina |
| OPT | of or relating to or involving light or optics |
| OPT | relating to or using sight |
| OPT | of or relating to or resembling the eye |
| OPT | an optical phenomenon resulting from the failure of a lens or mirror to produce a good image |
| OPT | apparatus for observation and measurement of optical phenomena |