Prescription Safety Glasses, Sports Glasses, Sunglasses, Eyeglasses

Blue light therapy and yellow goggles are becoming essential equipment for sleep disorders, for depression, and for seasonal affective disorder. Advanced sleep phase syndrome, delayed sleep phase syndrome, periodic insomnia, shift work sleep disorders, and jet lag are all related to circadian rhythm interruptions. Photoreceptor cells in the retina have been discovered that are directly linked to the “circadian pacemaker” of our brain: the pineal gland. The pineal gland produces melatonin which is the hormone responsible for our sleep-wake cycle. Daylight suppresses melatonin production and darkness stimulates its production, increasing sleepiness. Kate Le Page, in a recent article, traced the birth of light box therapy to the sanatoria of Europe in the 1870s. Sunlight was found beneficial to the treatment of bacterial diseases common at the time. Scandinavian countries, where the sun is in short supply for much of the year, have taken light therapy more seriously than the rest of the world. A light “shot” can be found on the menu in Finland cafes where you can drink your coffee while receiving your light therapy at the table. Sweden has equipped many cold war bomb shelters with full spectrum lights for therapy purposes. Russia is using light therapy to reduce worker sick days and to increase productivity. Their research has found a link between light therapy and an increase in the body’s ability to cope with pollutants and to boost immunization effectiveness.

Steven Lockley, Charles Czeisler, and George Brainard have done extensive studies on the utilization of blue light to combat sleep issues. They have found that blue light contains more energy than white light and it can be more efficient utilizing less time and energy to alter the sleep-wake cycles. Lockley, in the Harvard University Gazette, suggests that blue light “may be a powerful countermeasure for the negative effects of fatigue for people who work or study at night.” Blue light proved more beneficial than green light in reducing sleepiness, speeding reaction times, and focusing attention.

Dr. Joshua Gooley, in Annals Academy of Medicine, details more specific prescriptions:

• • For later sleep-wake times and phase delay shift:
    • Evening bright light therapy before bed, dim light after wake time.

• • For earlier sleep-wake times and phase advance shift:
    • Morning bright light therapy after wake time, dim light prior to bedtime.

• • For entrainment of sleep-wake cycle and phase advance shift:
    • Morning bright light therapy after wake time, when sleep episode occurs during night.

• • For adaptation to shift work and large phase delay shift:
    • Bright light therapy in evening/night, dim light after work, strict adherence to regular sleep-wake times.

• • For jet lag, eastward travel, and phase advance shift:
    • Morning bright light therapy after wake time (home time), dim light prior to bedtime.

• For jet lag, westward travel, and phase delay shift:
  • Evening bright light therapy before bedtime (home time), dim light after wake time.

Blue light boxes are available from many sources. The time required to affect a shift should be 15 to 30 minutes over a period of a couple of days. The light source should be placed 1 to 2 feet above the subject and not directly in line with the eye. The photoreceptors linked to your circadian pacemaker detect the light from the bottom of the retina. During dim light periods yellow goggles should be worn for 1 to 2 hours in order to filter out the blue light spectrum.

The best information I found on light therapy for treating depression and seasonal affective disorder (SAD) comes from psycheducation.org. Light therapy was proven to be as effective as antidepressant medication therapy with far fewer side effects. Its use, however, for depression and SAD should take place under a doctor’s supervision. Treatments were initiated at 30 minutes a day and decreased to 15 minutes for maintenance through the winter months. If you are a night owl, your treatment should occur as late as 8 or 9 am. If you are a lark, your treatment should occur as early as 5 am. The therapy works best when applied 8 to 9 hours after the onset of melatonin secretion. The time will be relative to your particular circadian rhythm. An excellent quiz to help determine your rhythm and optimum treatment times and durations can be found at cet-surveys.org.

Get ready for the blue lights and the yellow goggles. Before too long they will be mandatory equipment for our sleep deprived and depression plagued world. Until then, enjoy the sun and the natural cheer it brings!