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80 Ophthalmic Lenses

As spectacle lenses are designed to eliminate the polarized light in the
horizontal plane, the filter is placed vertically in the eyewear or eye rim.
This means that the filter must be properly aligned during surfacing and
edging layout, otherwise filters will not work properly.

ADVANTAGES OF POLAROID LENSES
1. Filters glares
2. Enhances contrast and depth perception
3. Reduces eye strain, greater comfort
4. Improves visual acuity, provides safety
5. Eyes feel rested
6. Realistic perception
7. Reduces reflection
8. Comfortable and attractive – looking sun wear.

TINTS VS. POLARIZED LENSES
Although, darkly tinted sunglasses may reduce brightness, they do not
remove glares like polarized lenses. In addition, dark sunglasses without
added ultraviolet protection may cause more damage to the patients eyes
than not wearing sunglasses at all. The darkness of the lens can cause the
pupil to dilate, letting more ultraviolet rays into the inner parts of the eyes.
Polarized lenses solve both problems by eliminating glares and filtering
out harmful ultraviolet light because the filter reduces the polarized glare
and also has UV absorbing properties.

Fig. 7.13

DISPENSING TIPS FOR POLAROID LENSES
Boaters, fishers and water sports players have used polarized sunglasses
to reduce the effect of glare from water surface. In the past few years, the
benefits of polarized lenses have been realized by a variety of other outdoor
sports enthusiasts as well as by drivers and general use wearers. Besides
them, the skiers, golfers, bikers, and joggers can also enjoy a clearer view