Reviews Supplements Essilor CE February 2014 : Page 1

2 CE Credits (Cope Approved) The Lowdown on Blue Light: Good vs. Bad, and Its Connection to AMD Ultraviolet and Blue Light Ron Melton, OD e all know that light can be both harmful and benefi cial for our vision as well as our overall health. Here, I’ll provide a background on ultraviolet (UV) light and blue light. W light helps to regulate our sleep/wake cycle, which in turn helps to maintain and regulate memory, mood and hormonal balance. 4,5 The Nitty Gritty on UV Light Light: The Good and the Bad Sunlight contains UV and blue light. UV light is part of the non-visible light spectrum and we are exposed to it every day when we’re out in the sun. It can cause damage to our eyes, particularly the cornea and the lens. The cumulative effect of UV exposure can con-tribute to cataracts as well as the potential for pinguec-ula and pterygium. Blue light, which is part of the visible light spectrum, reaches deeper into the eye and its cumulative effect can cause damage to the retina. Furthermore, in certain wavelengths, blue light is implicated in the develop-ment of age-related macular degeneration (AMD). 1–3 The amount of exposure to blue light varies, depending on the time of day, the location and the season. The average proportion of blue light that’s found in sunlight during the day is between 25% to 30%. Even on a cloudy day, up to 80% of the sun’s UV rays can pass through the clouds. Light is also essential for various functions. It helps us to see better, it helps us with our visual acuity and con-trast acuity, it helps us perceive colors, and it helps with various non-visual functions of the body. For example, Release Date: February 2014 Expiration Date: January 31, 2015 Goal Statement: This educational activity will explore the role of light, including how it can damage the eye and its link to age-related macular degeneration (AMD). The expert faculty will also cover other relevant topics, such as ways to prevent or reduce the risk of AMD as it strives to increase awareness of this general topic. Faculty/Editorial Board: Mark T. Dunbar, OD, and Ron Melton, OD Credit Statement: This course is COPE approved for 2 hours of CE credit. COPE ID is 40318-PS. Please check your state licensing board to see if this approval counts Visible light covers the range from 380 nm to 780 nm and UV light falls just beyond the shorter end of the visible spectrum, so it’s invisible to the human eye. It is divided into three zones: UVA, UVB and UVC. UVA is between 315 nm to 380 nm, and is the least damaging of the UV light. Tanning is the most popular effective UV exposure. UVB is between 280 nm and 315 nm, and has more energy. It is more energetic and fairly damaging if we’re exposed to it on a day-to-day basis. Acutely, it can cause sunburn and destruction of vitamin A. In more chronic forms, it can lead to skin thickening, wrinkling and possibly damage to DNA, which can lead to mela-nomas and other skin disease. So exposure to UVB is cumulative to both the body and the eyes. UVC is in the range of 100 nm to 280 nm, and is the most biologically active of the UV light. Brief exposure can create permanent damage to human tissue. Fortu-nately, UVC is absorbed mainly by the ozone layer in the upper atmosphere. To review, UV light can have an additive effect to damage the eye and can be a major risk factor for the formation of cataract cell life. It’s important to remember toward your CE requirement for relicensure. Joint-sponsorship Statement: This continuing education course is jointly sponsored by the University of Alabama School of Optometry. Disclosure Statement: Dr. Dunbar has disclosed the following relationships: Allergan Optometric Advisory Panel, Carl Zeiss Meditec Optometric Advisory Board, ArticDx Op-tometry Advisory Board, Sucampo Pharmaceutical Optometry Advisory Board, Vision Expo Continuing Education Advisory Board East and West: 2005–Present. Dr. Melton disclosed having direct fi nancial and/or proprietary interests in Alcon Laboratories, Bausch + Lomb, ICARE-USA, Jobson Publishing and Nicox. Sponsored by Supported by an unrestrictededucational grant from REVIEW OF OPTOMETRY FEBRUARY 2014 1 1

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