Unveiling the Dangers

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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?

<p>They are responsible for snow blindness and photo keratitis caused by welding arc, and can cause pingicula and pterigium formation with prolonged exposure.</p> Signup and view all the answers