a small oval-shaped area on the retina marking the site of entrance into the eyeball of the optic nerve See blind spot (sense 1)
- Optic disk
optic disk n. The small, circular, optically insensitive region in the retina containing no rods or cones, where fibers of the optic nerve emerge from the eyeball. Also called blind spot, optic papilla.
- Optic foramen
optic foramen n. See optic canal.
[op-tish-uh n] /ɒpˈtɪʃ ən/ noun 1. a person who makes or sells eyeglasses and, usually, contact lenses, for remedying defects of vision in accordance with the prescriptions of ophthalmologists and optometrists. 2. a maker or seller of optical glass and instruments. /ɒpˈtɪʃən/ noun 1. Compare ophthalmologist n. 1680s, after French opticien “maker or seller of […]
opticianry op·ti·cian·ry (ŏp-tĭsh’ən-rē) n. The professional practice of filling prescriptions for ophthalmic lenses, dispensing eyeglasses, and fitting contact lenses.