Photonics Dictionary: P

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peripheral vision

The ability to see over large angles of view.

photopic vision

Vision by means of retinal cones; color vision. Relatively high levels of luminance are required for photopic vision.

pairing

In interlaced television scanning, an effect in which the lines of one field fail to fall exactly within the lines of the following field, both fields comprising one frame of the picture. The lines...

perimeter -> eye test apparatus

Instruments used by ophthalmologists and optometrists to study the eye. There are, for instance, the ophthalmoscope to observe and photograph the retina; the retinoscope and optometer to determine...

photocathodes

Photocathodes are specialized materials or surfaces that exhibit the photoelectric effect, wherein the absorption of photons leads to the emission of electrons. When photons with sufficient energy...

photomultiplier tube

A photomultiplier tube (PMT) is a highly sensitive vacuum tube that detects and amplifies low levels of light. It is widely used in various applications where high sensitivity, fast response times,...

photorefractive keratectomy

A surgical procedure for correcting vision by reshaping the outer surface of the cornea through the use of a laser system.

phototherapy

Phototherapy is a medical treatment that involves the use of light to treat various conditions, particularly those related to the skin or mood disorders. There are different types of phototherapies,...

picture element -> pixel

A pixel, short for "picture element," is the smallest controllable element of a digital image or display. It is a fundamental unit that represents a single point in a raster image, which is a grid of...

picture monitor

A kinescope used to survey the details of television video transmission.

picture tube

A term referring to the cathode-ray tube used in television receivers.

pixel

Polarization Imaging

A subsurface imaging technique based upon the polarization of light reflected off an object. The polarization of reflected light gives information about the object's absorption properties that...

primary colors

A set of three colored lights which, when mixed, give the sensation of white light. The set used in color television, for example, is red, green, blue (RGB).

PVS

programmable vision systems

Photonics DictionaryP

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