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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 
auxiliary lenses
Eyewear; Optometry
Additional corrective lenses to facilitate access to higher refractive powers without an excessive numbers of lenses.
astigmatic difference
Eyewear; Optometry
Vertex power in the second principal meridian minus that in the first principal meridian.
astigmatic effect
Eyewear; Optometry
Collective description of the cylindrical power and the cylinder axis.
astigmatic power lens
Eyewear; Optometry
Lens bringing a paraxial pencil of parallel light to two separate line foci mutually at right angles and hence having vertex power in only the two principal meridians.
astronomical telescope
Eyewear; Optometry
Compound optical system, afocal in normal adjustment, consisting of a positive objective element or group and a positive ocular element or group forming a magnified, inverted ...
abbe number
Eyewear; Optometry
Mathematical expression for determining the correction for chromatic aberration of an optical material of component.
Sub-categories
- Contact lenses (3070)
- Eye surgery (2811)
- Glasses (802)
- Optometry (16172)
- Sunglasses (524)