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Sun position refers to the location of the sun relative to the horizon and overhead zenith at any point in the day. Because the eye's natural defenses (brows and upper lids) are designed to shield against overhead light, the sun's angle significantly changes the risk of UV exposure. When the sun is lower in the sky, it can enter the eye from the side or below, bypassing the eye's natural shade.
read more about sun position ...The most dangerous times for eye damage are when the sun is low in the sky, typically during the early morning and late afternoon hours. During these times, the sun's rays come at a shallow angle, directly penetrating the front and sides of the eye and increasing the risk of both UV damage and acute glare.
Side glare refers to the sunlight entering the eye from the peripheral field of view when the sun is low. This is often an issue when driving or walking, as the glare can scatter across the inside of the lens, reducing visual clarity. This is why sunglass frames with wide temples (sides) or wrap-around designs are often recommended.
The most extensive protection involves wearing wrap-around sunglasses with 100% UV protection. The wrap-around design shields the eyes from direct and peripheral UV radiation entering from the sides and above, covering the vulnerable tissues that traditional frames leave exposed.
Does the sun position matter on a cloudy day?
Yes. Even when it is cloudy, up to 80% of UV rays can penetrate the clouds. If the sun is low and bright, it can still cause dangerous direct exposure and glare, making year-round protection essential.
Is my car windshield enough to protect my eyes?
Car windshields block most UVB rays, but they often allow a significant amount of UVA rays to pass through. You still need quality sunglasses labeled UV400 to protect your eyes from long-term UVA damage while driving.
Should I wear UV-blocking contact lenses if I wear a hat?
Yes. While a hat helps block overhead light, UV-blocking contact lenses (available through Lens.com) provide an important layer of direct protection for the cornea and the interior of the eye against light entering from the side, which the hat cannot block.