MCQ MAHE 2000 Dermatology Answer 2

The Correct Answer is A

Ultraviolet (UV) radiation is a form of nonionizing radiation and behaves in accordance to the laws and principles of geometric optics.

Biological effects from UV radiation vary with wavelength, exposure level, and duration of exposure. In general, adverse effects are limited to the skin and eyes. Erythema (e.g. reddening of the skin in sunburn) is the most commonly observed effect on the skin. Erythema is a photochemical response to the skin normally resulting from overexposure to wavelengths in the UV-C and UV-B bands. Exposure to UV-A alone can produce erythema, but only at very high radiant exposures. Chronic exposure to UV radiation may accelerate the skin aging process and increase the risk of developing skin cancer.

Elevated exposure of UV-B and UV-C radiation may adversely affect the eye and cause photokeratitis and/or conjunctivitis. A sensation of “sand in the eyes” and reddening of facial skin usually occurs within 6-12 hours of the exposure, with the symptoms and discomfort lasting up to 48 hours. UV radiation exposure rarely results in permanent ocular injury, although cataracts have been produced in animals by exposure to UV radiation in the UV-B and UV-A bands.

Category: MAHE 2000 MCQs