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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

meridian of a lens

Eyewear; Optometry

Each plane which contains the optical axis of a lens.

measured power

Eyewear; Optometry

Dioptric power at a specified point on a spectacle lens by measurement using a given method.

main lens

Eyewear; Optometry

Lens to which one or more segment lenses are added to make a multifocal lens.

major portion

Eyewear; Optometry

That portion of a lens with the larger or largest field of view.

major reference point

Eyewear; Optometry

That point on the front surface of the lens at which the dioptric power for the distance portion shall apply.

margin

Eyewear; Optometry

That part of a lenticular lens surrounding the lenticular portion.

matching lens

Eyewear; Optometry

Lens fitted to a spectacle frame or mount to balance the weight and/or the appearance of the other lens. Also known as balancing lens.