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Insurance
Insurance is a promise of compensation for specific potential future losses in exchange for a periodic payment. Insurance is designed to protect the financial well-being of an individual, company or other entity in the case of unexpected loss. Some forms of insurance are required by law, while others are optional. Agreeing to the terms of an insurance policy creates a contract between the insured and the insurer. In exchange for payments from the insured (called premiums), the insurer agrees to pay the policy holder a sum of money upon the occurrence of a specific event. In most cases, the policy holder pays part of the loss (called the deductible), and the insurer pays the rest. Examples include car insurance, health insurance, disability insurance, life insurance, and business insurance.
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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.
