‍Fortunately, the amount of UV seeping through windows is small in comparison to outdoors. Unfortunately, however, there are not many places where we are deemed “safe” from UV radiation. Although the amount of UV coming through windows is small when compared to being outside, there is certainly no argument as to whether or not UV is seeping through.

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The problem, though, is that windshields only protect the front side of your face. The side window of your car is made out of a different type of glass (tempered glass). Tempered glass is known to block 60–70% of UVB rays, but not UVA.

As you can see, the windshield seems to be an effective medium blocking UV radiation — which, in other words, means that you are generally safe while behind the wheel. It is important to note, however, that windshields are made from laminated glass — a type unique to windshields. Laminated glass is made from laminated plastic between two layers of glass, which is known to block 98–99% of all UV light.

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‍UV radiation has three different components of varying wavelengths. These are UVA, UVB, and UVC; they decrease in length from ‘A’ to ‘C’. UVC rays are absorbed by the atmosphere, and thus do not affect us. UVB rays only affect the top layer of our skin (epidermis), and are the cause of most sunburns. UVA rays account for 95% of the UV radiation on earth’s surface, and penetrate the second layer of our skin (dermis).

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For another safe and convenient way to clean your glasses, click here. Remember: don’t use your shirt, saliva, paper products or other household cleaners to clean your lenses and frames as these materials may cause smears or scratches that can damage your lens coatings.

Wipe pre-moistened lens wipe onto each lens in a swiping motion. Be careful not to wipe in a circular motion as doing so could grind any remaining dirt or debris into the lenses and damage them.

Double-paned windows were chosen for this experiment not because of any UV-related connection; but rather, these windows are the most commonly found in homes and business around the world. As a result, it is almost certain that you may come into contact with these windows on a daily basis.

Home windows are generally made from double-layered soda-lime glass. While it is true these types of windows aren’t capable of windshield-esque protection, they are capable of some protection.

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‍Below is the data for the car’s detected UVI (along with pictures of the windows themselves). The results were condensed into one graph as a means to compare the UV coming through.

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In case the midday recordings seem a bit out of place to you— think about it: when the sun is at it’s peak (solar zenith), it is shining directly down on earth. As a result, there is not much sun coming directly through windows as the majority of the rays are hitting the top of the building you may be in.

I measured these three components behind a regular home window (same type of glass as a clear glass door or office window), a car windshield, and a car’s side window. Measurements were taken at three different times during the day: in the morning (9 am — 10 am), early afternoon (1 pm — 2pm), and late afternoon (5pm — 6pm). Each of these recordings were made in accordance with the sun’s orientation (morning recordings were done with the window facing east, afternoon with window facing west)

Wash and rinse your hands thoroughly with water and oil-free soap to make sure your hands are free from dirt or grime that could transfer to your lenses. Use a lint-free towel to dry your hands.

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The lack of efficiency behind these side windows are the cause for many studies done in which it was concluded that people who had spent a lot of time driving a car were more likely to develop skin cancers on the left sides of their bodies and faces — the side exposed while driving.

For those who are curious, the percentage of UVA v.s. UVB for a car’s side window and the home window was 57% t0 43%, respectively; the percentage of UVA v.s. UVB for a car’s windshield was 14% to 86%, respectively.

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These graphs help us conclude a few things about our safety in regards to UV radiation, but namely allow us to conclude that windowpanes are not UV blockers/filters; even the windshield let in some UV radiation.

Wipe lenses in a swiping motion to completely dry them. Be careful not to wipe in a circular motion as doing so could grind any remaining dirt or debris into the lenses and damage them.

Even though UVB constitutes a small fraction (5%) of the total UV radiation, it has a higher impact on human health and needs to be weighted higher. We utilize the UV Index (UVI), which is the medically accepted medium for determining how UV rays affect our skin.

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Brush debris from lenses in a swiping motion with a microfiber lens cleaning cloth that you can purchase at Shopko Optical.

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On the same note, these results should be read with the correct context. 1pm is solar zenith (when the sun is strongest), 9am-10am is within a 3–4 hour window of that, whereas 5pm-6pm is within a 4–5 hour window of that. As a result, the sun is lower on the horizon for the afternoon readings — which may help explain why those results are so much lower than the others.

Wash and rinse your hands thoroughly with water and oil-free soap to make sure your hands are free from dirt or grime that could transfer to your lenses. Use a lint-free towel to dry your hands.

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Wash and rinse your hands thoroughly with water and oil-free soap to make sure your hands are free from dirt or grime that could transfer to your lenses. Use a lint-free towel to dry your hands.

Now that we have seen that UV radiation does in fact come through to us while driving, let’s see whether or not we are safe while at home or at work (with pictures of the windows used):

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Lens care options such as gel cleaner, lens cleaner and pre-moistened lens wipes are available at Shopko Optical for a convenient and affordable way to keep your glasses clean and your vision clear on a daily basis.

‍To determine how much ultraviolet radiation comes through the windows we spend our lives behind, a Shade sensor and a radiometer were used in order to accurately measure the UVA, UVB, and UVI (0–3 ft. away).