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g is fitted to perform; a function; -- answering to duty in intelligent beings. They [the eyes] resign their office and their light. Shak. Hesperus, whose office is to bring Twilight upon the earth. Milton. In this experiment the several intervals of the teeth of the comb do the office of so many prisms. Sir I. Newton.…

A compound eye, as of insects and crustaceans.

One of the single eyes forming the compound eyes of crustaceans, insects, and other invertebrates.

knowing or wise; as, the omniscient God. -- Om*nis"cient*ly, adv. For what can scape the eye Of God all-seeing, or deceive his heart Omniscient Milton.

One who, or that which, opens. "True opener of my eyes." Milton.

With eyes widely open; watchful; vigilant. Shak.

popular name. Called also dancing girls. -- Opera glass, a short telescope with concave eye lenses of low power, usually made double, that is, with a tube and set of glasses for each eye; a lorgnette; -- so called because adapted for use at the opera, theater, etc. -- Opera hat, a gentleman's folding hat. -- Opera…

An inflammation of the membranes or coats of the eye or of the eyeball.

Of, pertaining to, or in the region of, the eye; ocular; as the ophthalmic, or orbitonasal, nerve, a division of the trigeminal, which gives branches to the lachrymal gland, eyelids, nose, and forehead. Ophthalmic region (Zoöl.), the space around the eyes.

An eyestalk; the organ which bears the compound eyes of decapod Crustacea.

The science which treats of the structure, functions, and diseases of the eye.

asuring the size of a reflected image on the convex surface of the cornea and lens of the eye, by which their curvature can be ascertained.

An instrument for viewing the interior of the eye, particularly the retina. Light is thrown into the eye by a mirror (usually concave) and the interior is then examined with or without the aid of a lens. -- Oph*thal`mo*scop"ic, a.

which deduces the knowledge of a person's temper and character from the appearance of the eyes.

The organ of sight; an eye. The difference is as great between The optics seeing, as the object seen. Pope.

Of or pertaining to the eye; ocular; as, the optic nerves (the first pair of cranial nerves) which are distributed to the retina. See Illust. of Brain, and Eye.

A telescope with a diagonal eyepiece, suspended vertically in gimbals by the object end beneath a fixed diagonal plane mirror. It is used for delineating landscapes, by means of a pencil at the eye end which leaves the delineation on paper.

y the photochemical action of light on the visual purple; the fixation of an image in the eye. The object so photographed shows white on a purple or red background. See Visual purple, under Visual.

and objective mechanical means to determine the accomodative and refractive states of the eye and the scope of its function in general."

The eye, as luminous and spherical. [Poetic] A drop serene hath quenched their orbs. Milton.