op·ti·cal /ˈɑptɪkəl/ 形容詞
Op·tic Op·tic·al a.
1. Of, pertaining to, or using vision or sight; as, optical illusions. [wns=2]
Syn: -- ocular, optic, visual.
The moon, whose orb
Through optic glass the Tuscan artist views. --Milton.
2. Of or pertaining to the eye; ocular; as, the optic nerves (the first pair of cranial nerves) which are distributed to the retina; the optic (or optical) axis of the eye. See Illust. of Brain, and Eye. [wns=3]
3. Relating to the science of optics or to devices designed to assist vision; as, optical works; optical equipment. [wns=1]
Optic angle Opt., the angle included between the optic axes of the two eyes when directed to the same point; -- sometimes called binocular parallax.
Optic axis. Opt. (a) A line drawn through the center of the eye perpendicular to its anterior and posterior surfaces. In a normal eye it is in the direction of the optic axis that objects are most distinctly seen. (b) The line in a doubly refracting crystal, in the direction of which no double refraction occurs. A uniaxial crystal has one such line, a biaxial crystal has two.
Optical circle Opt., a graduated circle used for the measurement of angles in optical experiments.
Optical square, a surveyor's instrument with reflectors for laying off right angles.
adj 1: relating to or using sight; "ocular inspection"; "an optical
illusion"; "visual powers"; "visual navigation" [syn:
ocular, optic, visual]
2: of or relating to or involving light or optics; "optical
3: of or relating to or resembling the eye; "ocular muscles";
"an ocular organ"; "ocular diseases"; "the optic (or
optical) axis of the eye"; "an ocular spot is a pigmented
organ or part believed to be sensitive to light" [syn: ocular,