from The American Heritage® Dictionary of the English Language, 4th Edition
- adj. Of or relating to the eye or vision.
- adj. Of or relating to the science of optics or optical equipment.
- n. An eye.
- n. Any of the lenses, prisms, or mirrors of an optical instrument.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Of, or relating to the eye or to vision.
- adj. Of, or relating to optics or optical instruments.
- n. An eye.
- n. A lens or other part of an optical instrument that interacts with light.
- n. A measuring device with a small window, attached to an upside-down bottle, used to dispense alcoholic drinks in a bar.
from the GNU version of the Collaborative International Dictionary of English
- adj. Of, pertaining to, or using vision or sight.
- adj. Of or pertaining to the eye; ocular. See Illust. of Brain, and Eye.
- adj. Relating to the science of optics or to devices designed to assist vision.
- n. The organ of sight; an eye.
- n. An eyeglass.
from The Century Dictionary and Cyclopedia
- Relating or pertaining to vision or sight; visual; subservient to the faculty or function of seeing.
- Of or pertaining to the eye as the organ of vision; ocular; ophthalmic.
- Relating to the science of optics.
- The angle which the visual axes of the eyes make with one another as they tend to meet at some distance before the eyes.
- The angle between the optic axes in a biaxial crystal.
- The line in a doubly refracting crystal in the direction of which no double refraction occurs. Crystals belonging to the tetragonal and hexagonal systems have a single optic axis, coincident with their vertical crystallographical axis: hence they are said to be uniaxial. Crystals belonging to the orthorhombic, monoclinic, and triclinic systems have two optic axes, and hence are biaxial.
- Synonyms Optic, Optical. The former is chiefly said of the anatomy of the eye and of the physiology of vision, the latter chiefly of the science of optics: as, optic nerve, tract, lobe; optical angle, center, effect.
- n. The eye.
- n. An eye-glass; a magnifying glass.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adj. relating to or using sight
- n. the organ of sight
- adj. of or relating to or resembling the eye
The second pair are the optic nerves, which, under the name of the _optic tracts_, run down to the base of the brain, from which an optic nerve passes to each eyeball.
In fishes, reptiles, and birds they are hollow, and only two in number (corpora bigemina); they represent the superior colliculi of mammals, and are frequently termed the optic lobes, because of their intimate connection with the optic tracts.
McConnell enlisted in the Army Reserve in July 1967 at the height of the Vietnam War but received a medical discharge after less than six months for an eye condition called optic neuritis, according to limited information that has been made public.
The brain of a fish is very small, compared with the spinal cord into which it is continued, and with the nerves which come off from it: of the segments of which it is composed — the olfactory lobes, the cerebral hemisphere, and the succeeding divisions — no one predominates so much over the rest as to obscure or cover them; and the so-called optic lobes are, frequently, the largest masses of all.
The midbrain bears swellings that are particularly concerned with the sense of sight and are therefore termed the optic lobes ( "sight" G).
These diverticula make their appearance before the closure of the anterior end of the neural tube; after the closure of the tube they are known as the optic vesicles.
For example, if a dog be deprived of one hemisphere, the eye which was supplied from it with nerve-fibres continues able to see, or to transmit impressions to the lower nerve-centre called the optic ganglion; for this eye will then mechanically follow the hand waved in front of it.
The brain of a fish is very small, compared with the spinal cord into which it is continued, and with the nerves which come off from it: of the segments of which it is composed -- the olfactory lobes, the cerebral hemisphere, and the succeeding divisions -- no one predominates so much over the rest as to obscure or cover them; and the so-called optic lobes are, frequently, the largest masses of all.
In fact, the ganglionic corpuscles of each eye may be considered as constituting a little brain, connected with the masses behind by the commissure, commonly called the optic nerve.
The other subject is a 27-year-old man who lost his sight at 14 due to a form of blindness called optic nerve atrophy.