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Photokeratitis or ultraviolet keratitis is a painful eye condition caused by exposure of insufficiently protected eyes to the ultraviolet (UV) rays from either natural (e.g. intense direct or reflected sunlight) or artificial (e.g. the electric arc during welding) sources. Photokeratitis is akin to a sunburn of the cornea and conjunctiva.
Long-term contact lens use can lead to alterations in corneal thickness, stromal thickness, curvature, corneal sensitivity, cell density, and epithelial oxygen uptake, etc. Other changes may include the formation of epithelial vacuoles and microcysts (containing cellular debris) as well as the emergence of polymegethism in the corneal endothelium.
Exposing skin to the ultraviolet radiation in sunlight has both positive and negative health effects. On the positive side, exposure allows for the synthesis of vitamin D 3. Vitamin D has been suggested as having a wide range of positive health effects, which include strengthening bones [1] and possibly inhibiting the growth of some cancers.
Here's how to choose the right sunglasses that will protect your eyes. UV rays from the sun can damage the eyes, increasing your risk of diseases and cancer. Here's how to choose the right ...
Linda Farrow Alexis Sunglasses. A personal favorite to wear daily, Linda Farrow sunglasses are sturdy and sleek. The London-based brand, founded in the 1970s, creates a variety of styles from bold ...
Need a fresh pair of shades? Check out the 7 best sunglasses for men from top brands, including Ray-Ban, Warby Parker, and more.
Flash blindness is an either temporary or permanent visual impairment during and following exposure of a varying length of time to a light flash of extremely high intensity, such as a nuclear explosion, flash photograph, lightning strike, or extremely bright light, i.e. a searchlight, laser pointer, landing lights or ultraviolet light. [1]
Randolph Engineering. One of the few big brands doing sunglasses in the U.S. of A., Randolph produces its signature aviators—built to military specifications, so you know they're tough as nails ...