Concave lens

A lens with a hollow shape like the inside surface of a ball. Concave lenses are minus power lenses and are used to correct myopia (nearsighted, shortsighted vision).

bi-concave lens

Photography; Professional photography

simple lens or lens shape within a compound lens, whose surfaces curve toward the optical center. Such a lens causes light rays to diverge.

lens

Biology; Neuroscience

Transparent structure in the eye whose thickening or flattening in response to visceral motor control allows light rays to be focused on the retina.

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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Elizabeth Taylor

A three-time Academy Awards winner, Elizabeth Taylor is an English-American film legend. Beginning as a child star, she is known for her acting talent ...