MEDICAL DICTIONARY
Photokeratitis: A burn of the cornea (the clear front surface of the eye ) by ultraviolet B rays (UVB). Also called radiation keratitis or snowblindness.
The condition typically occurs at high altitudes on highly reflective snow fields or, less often, with a solar eclipse. Artificial sources of UVB can also cause snowblindness. These sources include suntanning beds, a welder's arc (flash burn, welder's flash, or arc eye), carbon arcs, photographic flood lamps, lightning, electric sparks, and halogen desk lamps.
Symptoms include tearing, pain , redness, swollen eyelids, headache , a gritty feeling in the eyes, halos around lights, hazy vision, and temporary loss of vision. These symptoms may not appear until 6-12 hours after the UBV exposure.
Treatment consists mainly of keeping the eye closed with patches, after instilling a few drops of ophthalmic antibiotic solution, such as sulfacetamide sodium 10% with methylcellulose or gentamicin. Vision usually returns after 18 hours. The surface of the cornea usually regenerates in 24 to 48 hours.
Prevention involves sunglasses with adequate UVB protection and full coverage of the eyes (side shields).
|
DISCLAIMER:
Information on this site is provided for informational
purposes and is not meant to substitute for the advice
provided by your own physician or other medical professional.
You should not use the information contained herein
for diagnosing or treating a health problem or disease,
or prescribing any medication. You should read carefully
all product packaging. Not all Canadian drugs, Canada
prescription and Canadian prescription medicine is available
at discount Canadian on line pharmacies. If you have
or suspect that you have a medical problem, promptly
contact your health care provider. Information and statements
regarding diet supplements have not been evaluated by
Health Canada and are not intended to diagnose, treat,
cure, or prevent any disease. All trade and service
marks mentioned on this site are recognized as belonging
to their respective owners.
|
|
|
|
