''Snow blindness'' is

Options

A. inflammation of cornea
B. cataract formation
C. fail to distinguish red and green colours
D. loss of vision

Answer

**Step-by-Step Solution:**

1. **Understanding Snow Blindness**: Snow blindness is a condition that occurs due to overexposure to ultraviolet (UV) rays, particularly UVB radiation. It primarily affects the eyes.

2. **Cause of Snow Blindness**: The main cause of snow blindness is the inflammation of the cornea, which is the clear, protective outer layer of the eye. This inflammation is a result of excessive UV exposure.

3. **Role of Ozone Layer**: The ozone layer, located in the stratosphere, acts as a protective shield that absorbs most of the harmful UV radiation from the sun. When the ozone layer is depleted, more UV rays reach the Earth's surface, increasing the risk of conditions like snow blindness.

4. **Symptoms of Snow Blindness**: Symptoms may include pain, redness, blurred vision, and a sensation of having sand in the eyes. These symptoms are due to the inflammation of the cornea.

5. **Conclusion**: Therefore, snow blindness is specifically defined as the inflammation of the cornea caused by excessive exposure to UVB radiation.

**Final Answer**: Snow blindness is the inflammation of the cornea.

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