pupil distance

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• Pupil — The pupil is the hole that is located in the center of the iris of the eye and that controls the amount of light that enters the eye.Cassin, B. and Solomon, S. Dictionary of Eye Terminology . Gainsville, Florida: Triad Publishing Company, 1990.]… …   Wikipedia

• distance — The measure of space between two objects. [L. distantia, fr. di sto, to stand apart, be distant] focal d. the d. from the center of a lens to its focus. infinite d. the limit of distant vision, the rays entering the eyes from an object at that… …   Medical dictionary

• Exit pupil — In optics, the exit pupil is a virtual aperture in an optical system. Only rays which pass through this virtual aperture can exit the system. The exit pupil is the image of the aperture stop in the optics that follow it. In a telescope or… …   Wikipedia

• Entrance pupil — For the part of the eye, see Pupil. A camera lens adjusted for large and small aperture. The entrance pupil is the image of the physical aperture, as seen through the front of the lens. The size and location may differ from those of the physical… …   Wikipedia

• Pupillary distance — (PD) is the distance (usually measured in millimeters) between the centers of the pupils in each eye. This measurement is used when making prescription eyeglasses. Positioning lenses correctly in relation to the pupil centers is especially… …   Wikipedia

• tonic pupil — (Adie s pupil) a pupil that is dilated as a result of damage to the nerves supplying the ciliary muscle and iris. It reacts poorly to light but contracts normally for near vision, with slow redilation of the pupil on refixation at a distance. The …   Medical dictionary

• tonic pupil — Adie s pupil a pupil that is dilated as a result of damage to the nerves supplying the ciliary muscle and iris. It reacts poorly to light but may constrict better for near vision, with slow redilation of the pupil on refixation at a distance. The …   The new mediacal dictionary

• Argyll Robertson pupil — Ar·gyll Rob·ert·son pupil är .gīl räb ərt sən n a pupil characteristic of neurosyphilis that fails to react to light but still reacts in accommodation to distance Robertson Douglas Argyll (1837 1909) British ophthalmologist. The leading… …   Medical dictionary

• argyll-robertson pupil — |ärˌgīlˈräbərtsən noun Usage: usually capitalized A&R Etymology: after D. Argyll Robertson died 1909 Scottish physician : a pupil that fails to react to light but still reacts in accommodation to distance and that is characteristic of… …   Useful english dictionary

• interpupillary distance — the distance between the centers of the pupils of the two eyes when the visual axes are parallel; in practice usually measured from the lateral margin of one pupil to the medial margin of the other …   Medical dictionary

• Optical telescope — Eight Inch refracting telescope (Chabot Space and Science Center) An optical telescope is a telescope which is used to gather and focus light mainly from the visible part of the electromagnetic spectrum for directly viewing a magnified image for… …   Wikipedia