Trioptics GmbH - Worldwide Benchmark 4-24 LB

Type

Browse by Letter

Zurich Instruments AG - Lock-In Amplifiers 4/24 MR

48 terms

Photonics Dictionary

Clear All Filters x ocular x
ocular -> eyepiece

Also known as ocular. The lens system used between the final real image in a visual optical system and eye. It acts as an image magnifier. Many types of eyepieces are known; e.g., the Huygens used in...

ocular accommodation

The physical adaption of the eye lens, by means of ciliary muscle contraction, in order to maintain a clear, in focus image of light and other objects and surroundings at a given distance onto the...

ocular accommodation reflex

The eye's involuntary reaction in the process of accommodation. This reflex is most dramatic in response to looking at a distant object after having previously been focused on a near object or vice...

ocular prism

The prism used in a rangefinder to bend the lines of sight through the instruments into the eyepieces.

ocular surface

That surface of a lens located nearest to the eye.

accommodation -> ocular accommodation

The physical adaption of the eye lens, by means of ciliary muscle contraction, in order to maintain a clear, in focus image of light and other objects and surroundings at a given distance onto the...

binocular

Designating any instrument in which both eyes can be used to view the image to achieve a stereoscopic effect, or merely to facilitate observation. See also prism binoculars.

binocular collimation

The adjustment of a binocular instrument so that the lines of sight of both telescopes are parallel.

binocular luster

The glossy appearance of an object viewed, because of the binocular combination of two very unlike colors.

binocular magnifier

A device having a pair of decentered lenses, one for each eye, that focuses on a single object as a magnifier. It is often supplied with a forehead fixture or an elastic headband to leave the hands...

binocular microscope

A microscope designed with two eyepieces (oculars), permitting the use of both eyes when viewing through the instrument.

binocular parallax

The difference in angular bearing of an object as seen by the two eyes, due to the separation of the visual optical axes.

binocular threshold

The absolute luminance threshold for detection by the two eyes.

binocular vision

The ability of the two eyes to see an object from two slightly different points of view. This difference allows an individual to perceive the depth and dimension of the object in view.

biocular

A term pertaining to devices (generally optical) designed for use with both eyes viewing through a single exit pupil. The term may be distinguished from binocular in that biocular instruments contain...

infrared binoculars

An instrument, similar in design to regular binoculars, that can transmit and enlarge infrared images.

interocular distance

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

intraocular lens

A lens that is implanted within the eye to replace the eye lens, which has been removed because of cataract or other defect.

monocular

1. Viewed with one eye. 2. Describing an image as viewed from a single angle.

nominal ocular hazard distance

The calculated normal distance from a photon source at which harmful interaction with the incident light will occur. Interaction distance produces the effect of MPE (Maximum Permissable Exposure) on...

prism binoculars

A pair of telescopes with prismatically erected images, mounted side by side with the eyepieces at the interocular distance of the observer. This separation is adjustable with a convenient millimeter...

beam spread -> divergence

1. In optics, the bending of rays away from each other. 2. In lasers, the spreading of a laser beam with increased distance from the exit aperture. Also called beam spread. 3. In a binocular...

centrifuge microscope

A microscope that can be used to observe and magnify microscope specimens while they are being centrifuged. The objective rotates near the periphery of the centrifuge head, and the ocular is...

dipvergence

The vertical angular disparity between the lines of sight of the left and right systems in a binocular instrument. Dipvergence is plus when the right image is below the left image.

divergence

1. In optics, the bending of rays away from each other. 2. In lasers, the spreading of a laser beam with increased distance from the exit aperture. Also called beam spread. 3. In a binocular...

double vision

A defect of a binocular instrument causing two images to be seen separately instead of being fused. It is caused when the optical axes of the two telescopes are not parallel. In minor cases, the eyes...

eyepiece

feret's diameter

In microscopy, the measured distance between theoretical parallel lines that are drawn tangent to the particle profile and perpendicular to the ocular scale.

field glass

A handheld binocular telescope that is commonly of the Galilean type.

field of view

The field of view (FOV) refers to the extent of the observable world or the visible area that can be seen at any given moment through a device, such as an optical instrument, camera, or sensor. It is...

horopter

The locus of the points in the field of binocular vision that are observed singly. The images of these points correspond to the respective retinal points.

Huygenian eyepiece

An ocular having two planoconvex lenses that are formed from similar glass and that are separated by a space equal to half the sum of their focal lengths. This eyepiece is free of lateral chromatic...

interpupillary distance

The separation between the exit pupils of a binocular instrument. This usually is adjustable so that it can be set equal to the observer's interocular distance, a normal range being from 55 to 75 mm.

microstereoscope

A binocular microscope designed for the viewing of stereo pairs. As these stereoscopic image pairs are seen through a microstereoscope, they are merged into a single image allowing the brain to...

NOHD

nominal ocular hazard distance

NVM

night-vision monocular

Porro prism

A 45-90-45° reflecting prism whose surfaces form the 90° angle reflecting the light beam through a total angle of 180°. The corners of the prism are rounded to minimize breakage and simplify...

Porro prism erecting system

The arrangement of two Porro prisms so that the inverted image formed by certain types of optical instruments is the same as the object. The first prism, which is set at 90° to the second, inverts...

prism

A prism is a geometric optical element with flat, polished surfaces that refract light. It is typically a solid, transparent object with at least two flat surfaces that are inclined relative to each...

reflectance confocal microscopy

Reflectance confocal microscopy (RCM) is a non-invasive imaging technique that allows for high-resolution, in vivo imaging of biological tissues at the cellular level. It is particularly useful in...

relative brightness

A figure of merit corresponding to the amount of light seen by a viewer through binoculars. A higher number indicates a brighter image in low-light situations. The relative brightness value is...

relief

The discernment of depth or apparent difference in distance that causes the object to stand out from its background because of stereoscopic vision. The impression of relief can be obtained from the...

rhomboid prism

A reflecting prism that is rhomboidal in shape. It has two parallel transmitting faces, and two parallel reflecting faces; the latter are oblique to the former (usually but not necessarily at...

stereo acuity

The ability to perceive binocularly the apparent depth and relative distance of objects.

stereopsis

The perception of depth due to binocular vision.

stereoscope

A small instrument containing a picture support and a pair of magnifying lenses so arranged that the left eye sees only the picture taken with the left lens of the stereo camera, and the right eye...

stereoscopic rangefinder

A rangefinder similar to a pair of binoculars with a long base, a dot or other wander mark provided in each eyepiece field, together forming an apparent point in space. When one dot is moved...

visual field

The angular field of view that is seen by the eyes when fixed on a point straight ahead. The normal binocular visual field is approximately 130° in diameter.

Photonics Dictionary