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 the refractive errors of the eye; the ophthalmometer...

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

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

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

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

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

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

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

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

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

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

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