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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

fitting point

Eyewear; Optometry

That point on the front surface of a lens or semifinished lens blank stipulated by the manufacturer as a reference point for positioning the lens in front of the eye.

fitting height

Eyewear; Optometry

Distance between the lower rim of the frame and the pupil centre in the zero gaze direction.

field of illumination

Eyewear; Optometry

The angular field which is illuminated and which is measured with its apex positioned at the image of the light source.

distance reference point

Eyewear; Optometry

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

distance visual point

Eyewear; Optometry

Assumed position of the visual point on a lens which is used for distance vision under given conditions.

diverging lens

Eyewear; Optometry

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

dividing line

Eyewear; Optometry

Boundary between two adjacent portions of a multifocal or lenticular lens.

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