Best to Keep Lights Off and Sunglasses On

By Linda Conlin
Pro to Pro Manager, 20/20 Magazine

As the weather warms in the north, many of us are thinking of those glorious days at the beach, lying in the sun, and perhaps a nap. We’ll take the sunglasses off to avoid a “raccoon tan,” because we think our closed eyelids will protect our eyes. But maybe not so much. The eyelid skin is the thinnest of the body, and at least some light passes through. And then there’s the risk of skin cancers to the eyelid, including squamous cell carcinomas, basal cell carcinomas, and cutaneous melanoma. Squamous cell carcinoma can occur not just on the skin, but on the conjunctiva and invade the cornea and inside of the eye, in some cases necessitating removal of the eye. 

Recently, a scientist from Osaka Metropolitan University learned that closed-eye brightness is stronger than previously reported, even indoors during a night’s sleep. Studies have shown that changes in light exposure during the nighttime or during sleep have been reported to influence circadian rhythms and sleep quality. Understanding the light transmittance of the eyelids and perceived closed-eye brightness is essential to properly describe the lighting environment during sleep. (Osaka Metropolitan University, “Casting light on, and through, your eyelids”)

Professor Hideki Sakai, from the Graduate School of Human Life and Ecology at Osaka Metropolitan University, applied a new method to measure the light transmittance of the eyelids when the eyes are shut. A lighting device was used to increase or decrease facial illuminance, and closed-eye light transmittance was measured by having the 33 participants make adjustments to match the levels of brightness they perceived with their eyes closed and with their eyes open. Monochromatic red, yellow, green, and blue LEDs and a white LED were used as light sources. The results showed that eyelid transmittance values were up to 10 times higher than those reported in the past. The color of the light also made a difference, with red light perceived as brighter and blue light perceived as darker. Additionally, Professor Sakai noted significant differences between individual participants. For some, their perception of brightness remained almost unchanged between the open- and closed-eye conditions.

Light transmission through the eyelids has an impact on healthy sleep. When we sleep in a room with only light enough to see but not to read, the sympathetic arm of the autonomic nervous system responsible for the body’s fight or flight response remains active, disrupting sleep patterns. Reportedly up to 40 percent of us sleep with a bedside lamp on or with a light on in the bedroom, or keep the television on, not to mention a partner who may be scrolling on a smart phone late into the night. Sleep deprivation and sleep disorders are detrimental to health and interfere with daily life. 

When it comes to light exposure that can be detrimental to the eye and overall health, eyelids don’t offer the protection we may have thought they did. So keep the lights off and the sunglasses on.

Protect Your Eyes from Sun Damage this Summer — and in Every Season

Many sunglasses shoppers forget to check the UV rating before purchasing a pair. Be sure to select sunglasses that provide 100% UV or UV400 protection, or block both UV-A and UV-B rays. If you’re unsure, check out our recommended types of sunglasses.

Here are additional tips to protect your eyes from UV damage, no matter what the season: 

By embracing these simple guidelines, you and your family can enjoy the sun safely all year long.

Learn more from the American Academy of Ophthalmology

Congratulations Dr. Najarian!

This month, Bedminster Eye and Laser Center Founder and Medical Director Lawrence V. Najarian, MD, was among six individuals inducted into the Patriot Path Council Eagle Scout Hall of Fame (Dr. Najarian is shown at right in the photo with his son, Gregory, also an Eagle Scout).

The Eagle Scout Hall of Fame award is given to Eagle Scouts who have shown a long-term commitment to Boy Scouts and exceptional service to their community beyond their job or profession.

Dr. Najarian became an Eagle Scout at the very young age of 15. Only a tiny percentage of Boy Scouts ever complete the requirements for the rank of Eagle Scout, as it requires that all lesser ranks be attained first, and that a major community service project be completed by the Eagle Scout by his 18th birthday. Dr. Najarian has continued to be involved in Boy Scouts his entire life, as well as serves the community through other non-profit, charitable organizations.

What Are You Reading These Days

We’ve noticed that many of our patients enjoy reading a good book. We’re collecting recommendations for a “good read,” and we will be sharing them every month in our newsletter.

Below are reading recommendations for May 2023.

Have a reading recommendation? Email it to our Newsletter Editor.

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