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Eyewear
Eyeglasses, goggles or other objects worn over the eyes, usually to aid vision or for protective purposes.
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Eyewear > Optometry 
optical axis
Eyewear; Optometry
Straight line, perpendicular to both optical surfaces of a spectacle lens, along which light can pass undeviated.
ophthalmometer
Eyewear; Optometry
An instrument designed to measure and indicate the radii of curvature and principal meridians of the human cornea's, central area and of contact lenses.
negative lens
Eyewear; Optometry
Lens which causes parallel incident light to diverge from a virtual focus. Also known as minus-power lens.
nominal surface power
Eyewear; Optometry
Surface power stated by the manufacturer for identification purposes.
non-invasive ophthalmic instrument
Eyewear; Optometry
Ophthalmic instrument which does not in whole or in part penetrate inside the body, either through a body orifice or through the surface of the body.
ophthalmic lens
Eyewear; Optometry
Lens intended to be used for purposes of measurement, correction and/or protection of the eye, or for changing its appearance.
near portion
Eyewear; Optometry
That portion of a multifocal or progressive-power lens having the dioptric power for near vision.
Sub-categories
- Contact lenses (3070)
- Eye surgery (2811)
- Glasses (802)
- Optometry (16172)
- Sunglasses (524)