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Health care

Of or pertaining to the prevention and treatment of illness, and the preservation of physical and mental well-being, through the services provided by medical professionals.

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Health care > Optometry

optical axis

Eyewear; Optometry

Straight line, perpendicular to both optical surfaces of a spectacle lens, along which light can pass undeviated.

ophthalmometer

Eyewear; Optometry

An instrument designed to measure and indicate the radii of curvature and principal meridians of the human cornea's, central area and of contact lenses.

negative lens

Eyewear; Optometry

Lens which causes parallel incident light to diverge from a virtual focus. Also known as minus-power lens.

nominal surface power

Eyewear; Optometry

Surface power stated by the manufacturer for identification purposes.

non-invasive ophthalmic instrument

Eyewear; Optometry

Ophthalmic instrument which does not in whole or in part penetrate inside the body, either through a body orifice or through the surface of the body.

ophthalmic lens

Eyewear; Optometry

Lens intended to be used for purposes of measurement, correction and/or protection of the eye, or for changing its appearance.

near portion

Eyewear; Optometry

That portion of a multifocal or progressive-power lens having the dioptric power for near vision.

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