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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 
concave lens
Eyewear; Optometry
Lens which causes parallel incident light to diverge from a virtual focus. Also known as minus-power lens.
condensing lens
Eyewear; Optometry
A convex lens used to condense the illuminating beam into the patient's eye and to form a real inverted image of the retina thus illuminated.
lens blank
Eyewear; Optometry
Piece of material, usually preformed, for the making of a lens at any stage before completion of the surfacing processes.
reference seeing distance
Eyewear; Optometry
Agreed distance of 250 mm between the object side (first) nodal point of the eye and the object observed. The reference seeing distance is used, above all, as a reference ...
intraocular pressure
Eyewear; Optometry
Eye pressure, as determined by the amount of aqueous humor filling it. High IOP (ocular hypertension) can be a sign of glaucoma
interpupillary distance
Eyewear; Optometry
Distance between the centres of the pupils when the eyes are fixating an object at an infinite distance in the straight-ahead position.
Sub-categories
- Contact lenses (3070)
- Eye surgery (2811)
- Glasses (802)
- Optometry (16172)
- Sunglasses (524)