1. A lens situated at or near the plane of an internal image to project the aperture of a previous objective or erector upon the aperture of a following lens. 2. A lens at or near the plane of a ground-glass screen to bend the edge light toward the...

Also referred to as the opposition surge, the opposition effect is a photometric phenomenon in which a rough retroreflective...

The point to which the extension of the straight line, reaching from the sun to the observer's eye after penetrating the...

The velocity from object to observer, directed along the line of sight.

Characterizes a substance whose plane of polarization is rotated counterclockwise as the observer looks through the material...

1. The focal point. 2. To adjust the eyepiece or objective of a telescope so that the image is clearly seen by the observer....

A low-power telescope with a wide field of view, typically attached to a higher power telescope with a narrower field of...

A testing device that provides a contour map of the emergent wavefront for the observer in terms of the given wavelength of...

The image of the aperture stop, usually the objective lens, that is produced by the eye lens. When the exit pupil of the...

A projector designed to give each of the observer's eyes its own disparate image.

The lens of an eyepiece nearest the observer's eye.

Aspect of vision permitting the observer to distinguish among stimuli by their hue, saturation, and brightness or lightness.

A laser rangefinder is a device that uses laser technology to measure the distance between the device and a target. It...

RTSP, or real-time streaming protocol, is a network control protocol designed for controlling streaming media servers. It is...

The separation between the exit pupils of a binocular instrument. This usually is adjustable so that it can be set equal to...

The degree to which a pair of fine lines can be aligned to each other. A normal observer will demonstrate an accuracy of 10...

A dark region created by spherical aberration of an eyepiece's exit pupil. Because of the aberration, an observer's eye must...

Methodology for specifying color based on the CIE sources, observers, and coordinate system.

An astronomical telescope is a type of optical instrument designed to gather and magnify light from distant celestial...

Rayleigh scattering is a phenomenon that occurs when light waves interact with particles or molecules that are much smaller...

Hypothetical observer having standard color vision as described by standard color-matching properties.

An autocollimator is an optical instrument used for measuring small angular deviations with high precision. It operates on...

A shield of rubber, plastic or metal used to protect the eyes of the observer from stray light and wind, and to maintain the...

The field of view (FOV) refers to the extent of the observable world or the visible area that can be seen at any given...

The effect of a powerful gravitational field on light traveling through the field. This effect is detectable in astronomical...

A Laurent polarimeter is an instrument used in optics for measuring the rotation of plane-polarized light caused by...

The internet of things (IoT) refers to a network of interconnected physical devices, vehicles, appliances, and other objects...

A breakout cable, also known as a fan-out cable or breakout assembly, is a type of cable that combines multiple individual...

A pair of telescopes with prismatically erected images, mounted side by side with the eyepieces at the interocular distance...

Holography is a technique used to capture and reconstruct three-dimensional images using the principles of interference and...

The length of the small space within which the atmosphere exhibits coherence, particularly in relation to an observer on...

Family of deterministic models of plant canopy reflectance that provides deterministic formulation for each necessary...

Embedded vision refers to the integration of computer vision technologies into various embedded systems, devices, or...

An optical illusion in which distant objects are lighter in tone and less distinct in outline than those closer to the...

The direct appreciation of the distance between a given object and the observer, or between the front and back of a solid...

Equipment for testing an observer's color vision. Some tests require the identification or ordering of colored samples. The...

In colorimetry, the phenomenon in which spectrally different radiations produce the same color sensation for a given...

A reticle, also known as a reticule or graticule, is a pattern or set of markings placed in the focal plane of an optical...

Condition in which two stimuli appear to match in color to a specified observer, or in which two objects appear to match in...

Computation of tristimulus values by integrating or summing, over the visible wavelength region, the product of the relative...

The spreading of potentially equal radiation frequencies that results in broadening of the spectral line. This effect is...

The numerical definition of the ability of an observer to perceive fine detail. The average value may be taken as one...

The displacement of spectrum lines, as determined by the increasing distance between, and the relative velocity of, the...

The distance between the two eye pupils when the observer is viewing distant objects (normal = 62 mm).

Situation in which the observer requires fewer than three independent stimuli to make color matches. Dichromats require only...

A high-speed network or subnetwork that provides a connection between servers and data storage devices.

The principle stating that the displacement of spectrum lines is determined by the distance between, and relative velocity...

Microscopy is a scientific technique that involves the use of microscopes to observe and study objects that are too small to...

Also known as real holographic image. The indistinct, highly distorted image produced on the side of the hologram closest to...

An established point on which the observer's eye is focused.

The visual phenomenon of the apparent difference in the rate of motion of two objects that are actually moving at the same...

The unequal angular velocities of two objects moving at equal speeds but at different distances from the observer, which are...

A rangefinder similar to a pair of binoculars with a long base, a dot or other wander mark provided in each eyepiece field,...

A bench photometer that depends on the inability of the eye to distinguish color in brief flashes of light. Any difference...

GigE, short for gigabit Ethernet, refers to a standard for high-speed Ethernet communication, capable of transmitting data...

The adjustment of the eyepiece of an instrument to provide accommodation for the eyesight differences of individual...

A telescope lens is a primary optical component of a telescope system that gathers and focuses light to form an image. It is...

The effect produced on a wave frequency because of the relative motion of a source or an observer. The radiation emitted...

The visual examination by a trained observer of the image of a point source. Any coloring or departure from the Airy disc...