Long-term effects of excessive UV exposure include skin cancer, eye damage (cataracts), and suppression of the immune system. Among the atmospheric gases that are the major absorbers of UV radiation is ozone (O 3 ), which lies predominantly in the upper atmospheric region known as the stratosphere.

UV light can damage tissues indirectly by producing very reactive compounds (mainly free radicals and reactive oxygen) that go on to damage cells. The retina is very susceptible to this type of damage and is particularly vulnerable to radiation of short wavelength.

Excessive doses of ultraviolet radiation cause photochemical damage of tissue: UV photons disrupting DNA structures directly, or indirectly from free radical formation. The skin can suffer mild effects such as erythema (redness) of the skin, to blistering and swelling; to severe effects, such as skin cancer.

Depending on the amount and form of the radiation, as well as on the skin type of the individual exposed, ultraviolet radiation causes erythema, sunburn, photodamage (photoaging), photocarcinogenesis, damage to the eyes, alteration of the immune system of the skin, and chemical hypersensitivity.

Describe the damaging effects of UV radiation on living cells. UV causes damage to DNA by causing formation of pyrimidine dimers.

UV radiation is widely used in industrial processes and in medical and dental practices for a variety of purposes, such as killing bacteria, creating fluorescent effects, curing inks and resins, phototherapy and suntanning. Different UV wavelengths and intensities are used for different purposes.

Some artificial sources of UV radiation include:

• Tanning beds.
• Mercury vapor lighting (often found in stadiums and school gyms)
• Some halogen, fluorescent, and incandescent lights.
• Some types of lasers.

ultraviolet C

UV light, UVA, UVB and UVC, is powerful radiation from the sun that can damage your eyes. Photokeratitis– Caused by swelling of the cornea, outer most aspect of the eye, results in redness, swelling, blurred vision and pain.

Photokeratitis is a painful, temporary eye condition caused by exposure to ultraviolet rays. It’s sometimes compared to a sunburn, expect it affects the corneas of your eyes. Snow blindness happens when UV rays are reflected off snow and ice. Usually, your symptoms last only a few hours to a couple days.

Risks of UV Eye Exposure vision or even temporary blindness. In the long run, UV exposure can cause more serious eye diseases including cataracts, macular degeneration, and others, all of which can be a threat to vision.

Symptoms appear within eight to 24 hours of exposure. They include red eyes, a gritty feeling, extreme light sensitivity and excessive tearing. Photokeratitis can also result in temporary vision loss.

The short answer is if you squeeze your eyes shut very tight and then face the Sun, that should be enough to protect your eyes from damage. You should never look directly at the Sun, with or without sunglasses, even during a solar eclipse, because that can cause a lot of damage to the eyes.

Exposing your eyes to UV rays can harm your vision and cause a number of eye issues such as cataracts, corneal sunburn, macular degeneration, pterygium and skin cancer around the eyelids. As a result, they are at great risk of experiencing adverse effects of over-exposure to UV light.

Beware … damage will occur! When you stare directly at the sun—or other types of bright light such as a welding torch—ultraviolet light floods your retina, literally burning the exposed tissue. Short-term damage can include sunburn of the cornea—known as solar keratitis.

Permanent retinal damage can occur when someone looks at the sun for 100 seconds or less. This is under two minutes.

To protect your eyes from harmful radiation, you should follow these tips: Wear sunglasses: Wear sunglasses that block 99 – 100% UVA and UVB radiation. They should also screen out about 75 – 90% of all visible light. Your eyes need protection, even when it’s cloudy, since UV rays can penetrate clouds.

Background. Onychomycosis responds to systemic antifungals and sometimes to topical lacquers, but alternative treatments are desirable. Topical application of germicidal ultraviolet (UV) C radiation may be an acceptable and effective therapy for infected nails.

“So [the products being sold to consumers] are generally weak,” Dr. Nardell says. That means most of these UV light gadgets are misleading and not likely to be effective, Dr. Nardell says — and potentially dangerous, since people think they’re a good way to disinfect objects when they’re not.