Essilor Pro-B 300, User Manual

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P
ROGRESSIVE LENS
Type of lens whose power varies gradually between the far vision for the upper part of the lens and the near
vision for the lower part, without optical rupture or unaesthetic line.
R
EFRACTIVE INDEX
Characterizes the refractive power of a transparent optical material.
The indexes vary according to the materials used for the lenses:
• Plastic lens: 1.5
• Polycarbonate lens: 1.59
• Medium or High Index lens: > 1.5
• Trivex™ lens: 1.5 to 1.6
• Tribrid™ lens: 1.6
• Glass lens: 1.5 to 1.9
S
INGLE VISION LENS
Type of single vision lens correcting amétropies. The power of the lens is the same over all its surface.
S
TANDARD TRIPOD
Tripod used to center all types of lens, except for recut lenses and at very high-base.
S
YMMETRIC BINOCULAR TRACING
The shape of the right circle of frame is applied symmetrically to the left circle; the traced perimeters are
preserved.
T
RIFOCAUX 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 the near vision.
Pro-B 300 > v1.0 - 03.19
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LOSSARY