Sunlight: Good For the Eyes And The Brain
No, Not Staring Into The Sun, Just Outdoor Light
Of course, the sun is important because it offers us vitamin D for free, and is the major source of this important nutrient that has powerful effects throughout the body. Vitamin D allows one to more effectively use calcium, improves the immune system, helps prevents cancer, and is important for brain function..
Yet, millions of people have insufficient levels of vitamin D, and rickets—a once common condition of brittle bones in children caused by vitamin D deficiency that was very rare—has made a big comeback.
In addition to the healthy affect on your skin, sunlight also provides another positive benefit. The human eye contains photosensitive cells in its retina, with connections directly to the pituitary gland in the brain. Stimulation of these important cells comes from sunlight, in particular, the blue unseen spectrum. A study by Dr.’s Turner and Mainster of the University of Kansas School of Medicine, published in the British Journal of Opthamology in 2008 states that, “these photoreceptors play a vital role in human physiology and health.” The effects are not only in the brain, but the whole body.
Photosensitive cells in the eye also directly affect the brain’s hypothalamus region, which controls our biological clock. This influences our circadian rhythm, not just important for jet lag but for normal sleep patterns, hormone regulation, increased reaction time, and behavior. Most cells in the body have an important cyclic pattern when working optimally, so potentially, just about any area of the body can falter without adequate sun stimulation. Turner and Mainster state that, “ensuing circadian disturbances can have significant physiological and psychological consequences.” This also includes “increasing risk of disease” as the authors state, and as numerous other studies show, including cancer, diabetes, and heart disease.
The hypothalamus also regulates the combined actions of the nervous and hormonal systems.
The brain’s pineal gland benefits directly from the sun stimulation. The pineal produces melatonin, an important hormone made during dark hours that protects our skin. In addition, melatonin is a powerful antioxidant for body-wide use, is important for proper sleep and intestinal function, and can help prevent depression. (Aspirin, however, reduces melatonin production.)
Among the specific affects of the eye’s photosensitive cells are helping you get out of bed each morning. The transition from sleep to waking up requires the effects of the body’s adrenal glands, influenced by the brain’s hypothalamus and pituitary. Exposure to morning sunlight also helps raise body temperature to normal (after a slight reduction during sleep), and numerous brain activities including increased alertness and better cognition—helping mood and vitality. These changes are often not experienced in many people until their morning coffee kicks in. Taking a peek outside at the dawn’s first sunlight is a habit worth implementing.
Pedro Gomez OD
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