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Amaurosis :: Amaurosis (n.) A loss or decay of sight, from loss of power in the optic nerve, without any perceptible external change in the eye; -- called also gutta serena, the drop serene of Milton..

Catoptron :: Catoptron (n.) A reflecting optical glass or instrument; a mirror.

Definition :: Definition (n.) Distinctness or clearness, as of an image formed by an optical instrument; precision in detail..

Telescope :: Telescope (n.) An optical instrument used in viewing distant objects, as the heavenly bodies..

Flint Glass :: Flint glass () A soft, heavy, brilliant glass, consisting essentially of a silicate of lead and potassium. It is used for tableware, and for optical instruments, as prisms, its density giving a high degree of dispersive power; -- so called, because formerly the silica was obtained from pulverized flints. Called also crystal glass. Cf. Glass..

Anaclastics :: Anaclastics (n.) That part of optics which treats of the refraction of light; -- commonly called dioptrics.

Lens :: Lens (n.) A piece of glass, or other transparent substance, ground with two opposite regular surfaces, either both curved, or one curved and the other plane, and commonly used, either singly or combined, in optical instruments, for changing the direction of rays of light, and thus magnifying objects, or otherwise modifying vision. In practice, the curved surfaces are usually spherical, though rarely cylindrical, or of some other figure..

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

Mirage :: Mirage (n.) An optical effect, sometimes seen on the ocean, but more frequently in deserts, due to total reflection of light at the surface common to two strata of air differently heated. The reflected image is seen, commonly in an inverted position, while the real object may or may not be in sight. When the surface is horizontal, and below the eye, the appearance is that of a sheet of water in which the object is seen reflected; when the reflecting surface is above the eye, the image is seen pr

Enorthotrope :: Enorthotrope (n.) An optical toy; a card on which confused or imperfect figures are drawn, but which form to the eye regular figures when the card is rapidly revolved. See Thaumatrope..

Dioptra :: Dioptra (n.) An optical instrument, invented by Hipparchus, for taking altitudes, leveling, etc..

Inactive :: Inactive (a.) Not active; inert; esp., not exhibiting any action or activity on polarized light; optically neutral; -- said of isomeric forms of certain substances, in distinction from other forms which are optically active; as, racemic acid is an inactive tartaric acid..

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..

Optician :: Optician (a.) One skilled in optics.

#NAME? :: Subvaginal (a.) Situated under or inside a sheath or vaginal membrane; as, the subvaginal, or subdural, spaces about the optic nerve..

Chiasma :: Chiasma (n.) A commissure; especially, the optic commissure, or crucial union of the optic nerves..

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

Coptic :: Coptic (a.) Of or pertaining to the Copts.

Scioptics :: Scioptics (n.) The art or process of exhibiting luminous images, especially those of external objects, in a darkened room, by arrangements of lenses or mirrors..

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

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