SINGLE VISION LENS
Type of single vision lens correcting ametropia. The lens power is the same throughout its surface.
SYMMETRIC BINOCULAR TRACING
The shape of the right rim is applied symmetrically to the left rim; the perimeters traced are kept.
TRIFOCAL/ BIFOCAL LENSES
Type of lens with distinct correction areas:
• the upper part of the lens is used for far vision.
• the lower part of the lens is used for near vision.
TRIPOD
Tripod to be used for centering all types of lens, except recut lenses.
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