Health care

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

mean reflectance

Eyewear; Optometry

Mean value of the spectral reflectance over a wavelength range 400nm to 700nm, giving a physical rather than a visual quantification of the surface reflection.

magnification

Eyewear; Optometry

The ratio of the viewing angle of an object when observed through a magnifying system with the image at infinity to that of the object when observed by the naked eye at a ...

magnifier

Optometry; Optometry

Lens system designed to produce an enlarged image by relative distance magnification. It may be a simple single element or compound multiple element system.

magnification of photography

Optometry; Optometry

Ratio of the size of the image on the photosensitive target to that of the fundus at the centre of the photographic field, assuming that the eye is emmetropic and that it has a ...