Field of illumination

Field of illumination

The angular field which is illuminated and which is measured with its apex positioned at the image of the light source.

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Part of Speech: noun
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Industry/Domain: Eyewear
Category: Optometry
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Related terms

field of illumination

Eyewear; Optometry

The angular field which is illuminated and which is measured with its apex positioned at the image of the light source.

illumination

Art history; Visual arts

In art, the practice of illustrating books with designs and decorations (whether abstract, “floriated" i.e. Floral, or “historiated,” i.e. With images of persons and ...

illumination

Military; Missile defense

Non-interfering impingement of electromagnetic energy on Red, Blue, or Gray satellites and Red ballistic missiles in test.

illumination

Engineering; Electronic engineering

1. Visible light. 2. The condition of being irradiated by visible light. 3. The intensity of visible light irradiating an object or region.

illumination

Weather; Meteorology

In radar, a term sometimes used to describe 1) the irradiance or power density incident on a target, or 2) the irradiance or power density supplied by a feed to an antenna.

illumination

Science; General science

In a general sense, the science of the application of lighting. Radiation in the range of wavelengths of 0.38–0.76 micrometer produces the visual effect commonly called light by ...

ophthalmoscope

Eyewear; Optometry

An optical instrument used to examine the external and internal parts of the eye, particularly the media and the fundus.

pantoscopic angle

Eyewear; Optometry

1. Angle in the vertical plane between the optical axis of a spectacle lens and the visual axis of the eye in the primary position, usually taken to be the horizontal. 2. Angle ...

optical material

Eyewear; Optometry

Transparent material capable of being manufactured into optical components.

optical radiation hazard

Eyewear; Optometry

Possibility of damage to the retina by optical radiation.

optical centre

Eyewear; Optometry

For practical purposes, the intersection of the optical axis with the front surface a lens.

ophthalmoscope

Optometry; Optometry

An optical instrument used to examine the external and internal parts of the eye, particularly the media and the fundus.

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