1.67 Super-index Blue Blocker
High index lenses with 1.67 high index are good for people with prescriptions over +/-6.00 sphere, because they are thinner and lighter. Thinner lenses have three advantages: they do not look thick, they do not magnify or minify your eyes when seen by others, and they are lighter. The suggested prescription range is +/-6.00 to +/-8.00 sphere. Thinner, lighter and more expensive than mid-high index or hard resin lenses, high index lenses are a good choice for every day use.
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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