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Questions and Answers
What is the main source of ultraviolet rays?
Sunlight
Name the three bands into which UV light has been divided and briefly explain their effects.
- Ultraviolet A rays: absorbed by crystalline lens, protects retina, causes cataract formation. 2. Ultraviolet B rays: responsible for snow blindness and photo keratitis, can cause pingicula and pterigium formation. 3. Ultraviolet C rays: blocked by ozone layer.
How does ultraviolet A rays affect the eye?
They are absorbed by the crystalline lens and protect the retina, but prolonged exposure can cause cataract formation.
What are the effects of ultraviolet B rays?
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Which band of UV rays is blocked by the ozone layer?
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