OPTICAL • DICCIONARIO INGLES.COM • Definition of Optical

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/ˈɑptɪkəl/ Listen

adjective

Optical, Optic adj.

1.

Of, pertaining to, or using vision or sight; as, optical illusions.

Synonyms: ocular, optic, visual. "The moon, whose orb Through optic glass the Tuscan artist views."

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.

3.

Relating to the science of optics or to devices designed to assist vision; as, optical works; optical equipment.

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.

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Etymology of 'Optical'

Collaborative International Dictionary of English 0.48

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"Optical" Quotes from Famous Books

... The Microscope and Its Revelations, gives two drawings of it. Carpenter argues that it is impossible to accept that optical lenses had ever been made by the ancients. Never occurred to him—someone a million miles or so up in the air—looking through his telescope—lens ...

— The Book of the Damned • Charles Fort

... inside. Without being a spiritualist, Jean felt that nobody but spirits could come out of a room leaving the doors locked and the keys on the inside. But for that lock, he might have even set it down to optical illusion and have persuaded himself that perhaps she had really never ...

— Mlle. Fouchette - A Novel of French Life • Charles Theodore Murray

... metal manufacturing, dental products, ceramics, pharmaceuticals, food products, precision instruments, tourism, optical instruments ...

— The 2005 CIA World Factbook • United States. Central Intelligence Agency

... An odd optical delusion has amused me these two last nights. I have been of late, for the first time, condemned to the constant use of spectacles. Now, when I have laid them aside to step into a room dimly lighted, out of the strong light which I use for writing, I have seen, or seemed to see, through ...

— The Journal of Sir Walter Scott - From the Original Manuscript at Abbotsford • Walter Scott

... change produced by the alpha rays is unknown. But the formation of the halo is not, at least in its earlier stages, attended by destruction of the crystallographic and optical properties of the medium. The optical properties are unaltered in nature but are increased in intensity. This applies till the halo has become so darkened that light is no longer transmitted under the conditions of thickness obtaining in rock sections. It ...

— The Birth-Time of the World and Other Scientific Essays • J. (John) Joly

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