Today I Learn… I make a point of learning something new everyday. This is what I learn each day

1, Jul 18, 2012

Tips for hot days from Harvard Medical School, part IV

Filed under: Health — admin @ 12:49 am

The fourth but not the last tip is the protection of your eyes.

As we age, problems with eyesight become more common. Despite this, many people are not conscientious about caring for their eyes. Learn how to recognize the risk factors and symptoms of specific eye diseases — cataract, glaucoma, age-related macular degeneration, and diabetic retinopathy — and what steps you can take to prevent or treat them before your vision deteriorates further.

The ultraviolet rays in sunlight can damage your eyes every bit as much as your skin. The cornea is at particular risk. Even a single intense exposure can cause photokeratitis, or sun blindness. The symptoms are pain and light sensitivity, often accompanied by redness, tearing, and uncontrollable blinking. Fortunately, the cornea will usually repair itself in 12 to 48 hours.

But repeated low-level ultraviolet exposure can cause cumulative damage to the lens, ultimately resulting in cataracts. Sunglasses will prevent both problems if they have high-quality lenses that screen out UV rays.

Avoid lenses that are rated as “cosmetic.” Instead, look for sunglasses rated “general purpose” that absorb at least 95% of ultraviolet B rays and 60% of ultraviolet A. For intense exposures, turn to glasses with a “special purpose” rating; they absorb 99% of UVB.

There are some more tips and bug bites and plants problems, which I am not going to carry here.

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