PRK is surgery to help you see better without glasses or corrective lenses.

LASIK is laser surgery that helps reshape your cornea. It can help you see better without glasses or corrective lenses.

Refractive surgery can improve your eyesight, but it does have some risks.

Your vision depends on how light is focused in your eye. A look at 3 common problems with focusing that make vision blurry: farsightedness, nearsightedness, and astigmatism.

Learn about how a new lens is implanted after cataract surgery.

In hot environments, your body may have trouble keeping its temperature at a safe level. As a result, your body temperature rises to unsafe levels. This is heat stress. Heat stress can develop quickly. It can also be very dangerous to your health.

How much do you know about protecting your hearing? Take the quiz to find out.

Learn about how earplugs and earmuffs can protect you from hearing damage.

An audiometric test measures how well you hear. It's quick and painless. The Occupational Safety and Health Administration (OSHA) and your employer may require this test each year. Follow through with it. You can't "fail" a hearing test. The test results just help your employer know whether more hearing protection is required.

At the workplace, your employer measures noise with sound level meters and dosimeters. If the average noise exposure over an 8-hour work shift is 85 dB or higher, you need protection. OSHA requires your employer to have a hearing conservation program.