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Alternative therapy

Preventative and therapeutic health care practices, such as acupuncture, naturopathy, chiropractic, homeopathy and herbal medicine. Generally do not follow accepted medical methods. May not require medical explanations for their success or use.

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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.

Illuminated magnifier

Eyewear; Optometry

Magnifier incorporating illumination.

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.