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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 
binocular field of view
Eyewear; Optometry
Visual field of an individual perceived with both eyes open.
base setting
Eyewear; Optometry
Direction of the line from apex to base in a principal section of a prism.
bifocal lens
Eyewear; Optometry
Multifocal lens having two portions, usually for distance and near vision.
balancing lens
Eyewear; Optometry
Lens fitted to a spectacle frame or mount to balance the weight and/or the appearance of the other lens.
back surface
Eyewear; Optometry
That surface of the spectacle lens intended to be fitted nearer to the eye.
back vertex focal length
Eyewear; Optometry
Distance in an optical system from the back surface to the focal point measured along the optical axis (axis of symmetry).
Sub-categories
- Contact lenses (3070)
- Eye surgery (2811)
- Glasses (802)
- Optometry (16172)
- Sunglasses (524)