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Photics :: Photics (n.) The science of light; -- a general term sometimes employed when optics is restricted to light as a producing vision.

Perspectively :: Perspectively (adv.) Optically; as through a glass.

Eyepiece :: Eyepiece (n.) The lens, or combination of lenses, at the eye end of a telescope or other optical instrument, through which the image formed by the mirror or object glass is viewed..

Strabotomy :: Strabismus (n.) An affection of one or both eyes, in which the optic axes can not be directed to the same object, -- a defect due either to undue contraction or to undue relaxation of one or more of the muscles which move the eyeball; squinting; cross-eye..

Oculary :: Oculary (a.) Of or pertaining to the eye; ocular; optic; as, oculary medicines..

Asterism :: Asterism (n.) An optical property of some crystals which exhibit a star-shaped by reflected light, as star sapphire, or by transmitted light, as some mica..

Glass :: Glass (v. t.) An optical glass; a lens; a spyglass; -- in the plural, spectacles; as, a pair of glasses; he wears glasses..

Scoptical :: Scoptical (a.) Jesting; jeering; scoffing.

Dioptrics :: Dioptrics (n.) The science of the refraction of light; that part of geometrical optics which treats of the laws of the refraction of light in passing from one medium into another, or through different mediums, as air, water, or glass, and esp. through different lenses; -- distinguished from catoptrics, which refers to reflected light..

Perspicil :: Perspicil (n.) An optical glass; a telescope.

Optical :: Optical (a.) Of or pertaining to vision or sight.

Pebble :: Pebble (n.) Transparent and colorless rock crystal; as, Brazilian pebble; -- so called by opticians..

Optician :: Optician (a.) One who deals in optical glasses and instruments.

Field :: Field (n.) The space covered by an optical instrument at one view.

Optic :: Optic (a.) An eyeglass.

Autoptic :: Autoptic (a.) Alt. of Autoptica.

Phantasm :: Phantasm (n.) An image formed by the mind, and supposed to be real or material; a shadowy or airy appearance; sometimes, an optical illusion; a phantom; a dream..

Spectacle :: Spectacle (n.) An optical instrument consisting of two lenses set in a light frame, and worn to assist sight, to obviate some defect in the organs of vision, or to shield the eyes from bright light..

Define :: Define (v. t.) To determine with precision; to mark out with distinctness; to ascertain or exhibit clearly; as, the defining power of an optical instrument..

Power :: Power (n.) The degree to which a lens, mirror, or any optical instrument, magnifies; in the telescope, and usually in the microscope, the number of times it multiplies, or augments, the apparent diameter of an object; sometimes, in microscopes, the number of times it multiplies the apparent surface..

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