Reference plane

That which adds breadth to a line; a level surface. Plane surface may be contrasted with depth. In sculpture, planes define the surfaces of solid elements, in contrast to empty ...

plane

Art history; General art history

A plane surface is a flat surface, and any discrete flat surface within a painting or sculpture can be referred to as a plane. The flat patches seen in Cubist paintings are often ...

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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Industry/Domain: Earth science Category: Mapping science

Outline map

A map showing just enough geographic information to permit the correct placement of additional details. Outline maps correspond to what were at one ...