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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

gradient tinted lens

Eyewear; Optometry

Lens having a controlled variation in tint (transmittance and/or color) over the whole or part of the surface.

hand magnifier

Eyewear; Optometry

Magnifier intended to be positioned and supported by the user's hand without artificial support.

field of view

Eyewear; Optometry

The angular field which is visible to a user when the entrance pupil, measured from its centre, is 12 mm behind the back surface of the ophthalmoscope.

finished lens

Optometry; Optometry

Lens of which both sides have their final optical surface.

equivalent power

Eyewear; Optometry

Power of an infinitely thin lens which will produce an image of a distant object of the same size as that produced by the actual lens.

eye refractometer

Eyewear; Optometry

Instrument used for continuous or digital readout used for measuring the refractive error of the eye.

fitting point height

Eyewear; Optometry

Vertical distance of the fitting point above the horizontal tangent to the lens shape at its lowest point.