n
(electronics) A defect in an image produced by an optical or electrostatic lens system.
n
(optics) A lens generally composed of two separate lenses, one convex and one concave and generally of different materials, in such a way that the chromatic aberration produced by one is corrected by the other.
adj
(optics) Uniting the rays of light into one focus.
n
The part of optics that deals with the refraction of light.
adj
Being or involving a special kind of convex lens for a telescope that reduces the stadia constant to zero.
n
A distorted image of an object that may be viewed correctly from a specific angle or with a specific mirror.
adj
(optics, of an optical system) Free from, or corrected for, spherical aberration and chromatic aberration
n
(optics) Freedom from spherical aberration.
n
(optics) A kind of lens corrected for chromatic and spherical aberration.
adj
Alternative form of apochromatic [(optics) Corrected for both chromatic aberration and spherical aberration]
adj
(optics) Corrected for both chromatic aberration and spherical aberration
n
An instrument used to measure a person's hearing
n
An alternative eyesight therapy based on visualization, movement, and imagining visual marks and signs.
n
(optics) The construction and use of catadioptric lenses and systems
n
(optics, computer graphics) The envelope of reflected or refracted rays of light for a given surface or object.
n
(optics) A surface to which rays reflected or refracted by another surface are tangents.
n
(optics) An optical aberration in which an image has coloured fringes, caused by differential refraction of light of different wavelengths.
adj
Alternative form of confocal [(optics, mathematics) Having the same foci]
n
(optics) A method of designing optical systems in which the conformation of the lenses is chosen to optimize its interaction with the local environment
adj
Relating to the caustic curves formed by the refraction of light.
adj
Acting as a medium for sight; making use of refraction (of lenses, etc.).
n
(optics) an aberration that causes magnification to change over the field of view.
n
The duochrome test, a test used by opticians to refine the correction of refractive error, in which the subject is asked to compare images presented with red and green backgrounds.
n
An examination of the eyes involving of a series of nonintrusive tests to measure visual acuity and check for the presence of certain vision-impairing illnesses.
adj
Alternative spelling of fibre optic [Of, or relating to fibre optics, or to optical fibre.]
n
(optometry) Diffraction.
n
(rare) A compass of this kind.
adj
Of or pertaining to a lens.
n
A discredited psychological test that uses a person's color preferences to measure their personality.
n
(ophthalmology) Initialism of monocular estimate method.
n
A reduction of the apparent brightness of illumination when an adjacent visual field is illuminated
n
(optics) A monocentric lens
adj
(of an eyeglass lens) having several focusing areas that correct for both nearsightedness and farsightedness.
n
Alternative form of ocularium [A slit in a helmet through which the wearer could see.]
n
A reference point in the centre of each eye
n
(physics) The physics of light and vision.
n
(physiology) An image of external objects fixed on the retina by the photochemical action of light on the visual purple.
n
The production of orientifolds
n
Alternative form of orthoconoscope [Synonym of orthicon]
adj
(optics) Of certain achromatic lenses, having the same focus for the actinic and for the brightest of the visual rays.
adj
(optics) achromatic throughout a plane
adj
(optics) Describing an apochromatic lens system that produces a planar (flat) field
n
(optics) Reversed perception of depth.
adj
(optics) Of or pertaining to lenses that have four different powers per eye.
n
The art or process of exhibiting luminous images, especially those of external objects, in a darkened room, by arrangements of lenses or mirrors.
v
To experience double vision, wherein the eyes do not focus on the same point and a single object is therefore perceived as two.
adj
(zoology) Having six rays.
n
(optics) A type of lens aberration which causes blurriness, particularly away from the centre of the lens.
adj
involving the simultaneous use of a pair of eyes
adj
(optics) Relating to a compound lens which has its entrance or exit pupil at infinity; in the prior case, this produces an orthographic view of the subject
adj
(optics) Of or pertaining to corrective lenses that have three different powers per eye.
n
A quick screening test for hearing loss.
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