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Online services
Any business that provides its subscribers with a wide variety of data transmitted over telecommunications lines, an infrastructure in which they can communicate with one another as well as the means to connect with an almost unlimited number of third-party information providers.
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Alcoholism
Health care; Cancer treatment
A chronic disease in which a person craves drinks that contain alcohol and is unable to control his or her drinking. A person with this disease also needs to drink greater amounts ...
Atoroidal surface
Eyewear; Optometry
Surface having mutually perpendicular principal meridians of unequal curvature, of which the cross-section in at least one principal meridian is not circular.
Back vertex focal length
Eyewear; Optometry
Distance in an optical system from the back surface to the focal point measured along the optical axis (axis of symmetry).
Auxiliary lenses
Eyewear; Optometry
Additional corrective lenses to facilitate access to higher refractive powers without an excessive numbers of lenses.
Balancing lens
Eyewear; Optometry
Lens fitted to a spectacle frame or mount to balance the weight and/or the appearance of the other lens.
Atoric lens
Eyewear; Optometry
Lens with astigmatic power in which at least one principal meridian is not spherical.
Back surface
Eyewear; Optometry
That surface of the spectacle lens intended to be fitted nearer to the eye.
