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Non-profit organizations
Abbreviated as NGO, and also known as not-for-profit organisation; an organisation that does not distribute its surplus capital to shareholders or owners, but instead uses them to pursue its original goals.They are usually exempt from income and property tax and most often include charitable organisations, trade unions and public arts organisations.
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Lens blank
Eyewear; Optometry
Piece of material, usually preformed, for the making of a lens at any stage before completion of the surfacing processes.
Horizontal centre line
Eyewear; Optometry
Line located at equal distance from the two horizontal tangents of the boxing system.
Infrared radiation
Eyewear; Optometry
Optical radiation with a wavelength longer than that of visible radiation.
Focal length
Eyewear; Optometry
Distance in an optical system from the focal point to the corresponding principal point, measured along the optical axis (axis of symmetry).
Fixed-location stimulus perimeter
Eyewear; Optometry
Perimeter which utilises test stimuli that are at permanent locations on the background.
Fixation target
Eyewear; Optometry
Target used to locate the point where the patient should look during testing.
