Optic
81Optic axis of a crystal — For the axis of an optical system, see Optical axis. The optic axis of a crystal is the direction in which a ray of transmitted light suffers no birefringence (double refraction). Due to the internal structure of the crystal (the specific… …
82Optic nerve tumor — An optic nerve melanocytoma is a tumor made up of melanocytes and melanin. These tumors are typically a benign; they can grow, but rarely transform into a malignancy. Even so, local growth can affect adjacent tissues. Symptoms Optic nerve… …
83Optic papillitis — Papillitis Classification and external resources ICD 10 H46 ICD 9 377.31 DiseasesDB …
84optic chiasm — noun the crossing of the optic nerves from the two eyes at the base of the brain • Syn: ↑optic chiasma, ↑chiasma opticum • Hypernyms: ↑chiasma, ↑chiasm, ↑decussation * * * noun see optic chia …
85Optic cup (ophthalmology) — The optic cup is the white, cup like area in the center of the optic disc.cite journal |author=Algazi VR, Keltner JL, Johnson CA |title=Computer analysis of the optic cup in glaucoma |journal=Invest. Ophthalmol. Vis. Sci. |volume=26 |issue=12… …
86Optic vesicles — Infobox Embryology Name = PAGENAME Latin = v. ophthalmica GraySubject = 224 GrayPage = 1001 Caption = Transverse section of head of chick embryo of forty eight hours’ incubation. (Optic vesicle labeled at lower right.) Caption2 = Human embryo… …
87optic disc — noun the point where the optic nerve enters the retina; not sensitive to light • Syn: ↑blind spot, ↑optic disk • Hypernyms: ↑point • Part Holonyms: ↑retina * * * optic disc noun …
88optic thalamus — noun : either of two masses of nerve tissue in the floor of the diencephalon from which the optic nerves take their origin * * * optic thalamus noun (anatomy) An older name for ↑thalamus • • • Main Entry: ↑optic * * * optic thalamus, = thalamus.… …
89optic tectum — A region of the midbrain in which input from the optic nerve is processed. Because the retinally derived neurons of the optic nerve map onto the optic tectum in a defined way, the question of how this specificity is determined has been a long… …
90Optic disc — The circular area in the back of the inside of the eye where the optic nerve connects to the retina. Also called the optic nerve head. * * * the start of the optic nerve, where nerve fibres from the rods and cones leave the eyeball. See blind… …
