A shutter having one or more roller blinds of material with a variable slit that moves across the back of the camera when released and exposes the sensitized material progressively.

A ground-based navigation beacon that emits pulsed signals which are picked up by aircraft making an instrument (blind)...

An arc flash is a sudden release of electrical energy due to an electric arc — a continuous, high-current discharge of...

Short-distance scattering of light in holography caused by random index inhomogeneities and the developing index that...

An optical instrument that uses a yellow light of varying intensity with red and blue lights of fixed intensity to test for...

An apparatus, designed for use with a camera, that is used to rapidly open the path from lens to film, to maintain the...

The spot on the retina where the optic nerve is attached; it is incapable of sensing light because of the absence of light...

Instruments used by ophthalmologists and optometrists to study the eye. There are, for instance, the ophthalmoscope to...

Fixed-pattern noise is the measure of the static (nontemporal) differences between pixels when the detector is evenly...

Advanced driver assistance systems (ADAS) refers to a set of safety features and technologies designed to assist drivers in...

Visible laser radiation, often optically expanded and collimated, used to induced temporary blindness from within a walking...

The inability to perceive visual images (visible radiant energy). In human beings, blindness is defined as a visual acuity...