Polycarbonate Blue Blocker & Transition RX
Polycarbonate lens material is the best choice for children, active adults, and sporting activities. Polycarbonate lenses are virtually shatterproof, provide the best eye protection of any lens, and includes 100% UV protection inherently. If the sphere on your prescription is +/-3.00 or higher, you should choose polycarbonate lenses. Polycarbonate lenses are very difficult lenses to tint and are not recommended for people who want custom dark sunglass lenses (we suggest Trivex lenses in this case). The suggested prescription range for polycarbonate lenses is plano (0, no Rx) to +/-6.00 sphere.
What is Transitions(photochromic) Lenses?
Photochromic lenses are eyeglass lenses that are clear (or nearly clear) indoors and darken automatically when exposed to sunlight. Other terms sometimes used for photochromic lenses include "light-adaptive lenses" and "variable tint lenses." Transitions Lenses (Transitions Optical) are the most popular brand of photochromic lenses sold in the United States.
What do Blue Blocking Glasses do?
Blue blocking glasses prevent blue light from reaching the retina. The absence of blue light stimuli on the PRG's mimics natural physiological darkness. This in turn causes the SCN to signal the pineal gland to increase melatonin production. As melatonin production increases we feel sleepier and thus shift our phase sleep earlier.
What does the research show?
This study tested the hypothesis that cutting the blue portion of the light spectrum with orange lens glasses(blue blockers) would prevent the light-induced melatonin suppression. They concluded that blue blockers represent an elegant means to prevent the light-induced melatonin suppression.
Another study of the effectiveness of blue blocking glasses conducted in Switzerland shows that wearing blue blocking glasses at night time prevented light-induced melatonin suppression and alerting effects in young adults, and significantly improved subjective sleep quality after a continuous 2-week application.
Although the results are promising we should note that further research is underway. More importantly, larger studies testing more criteria should be conducted to fully evaluate the ideal conditions under which blue light blocking glasses are effective.
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