Question

Cataract blinds at least 120 million people globally every year. What is its main cause?

• A. Gasoline fumes
• B. Heredity
• C. Ultraviolet radiations
• D. Unbalanced diet

Answer 1

The correct option is C

Ultraviolet radiations

The correct option is C

Explanation of the correct option:

1. A cataract is when a person's eye's natural lens becomes cloudy.
2. The protein in the eye lens breaks down and causes things to look blurry, hazy, or less colorful.
3. Natural sunlight has ultraviolet rays that can cause damage to the proteins in our eyes and cause cataracts.
4. Prolonged exposure to sunlight may deteriorate the eye lens.

Explanation of the incorrect option:

Option A:

1. Gasoline fumes are harmful to humans.
2. The small number of gasoline fumes can lead to nose and throat irritation, headaches, nausea, vomiting, etc.
3. It also causes breathing difficulties. High-level of gasoline can cause fainting and even death.

Option B:

1. Heredity is the sum of all the biological characteristics that individual posses that can be transferred to the offspring.
2. Hereditary diseases are genetic disorders that occur due to mutation.
3. A cataract is not a hereditary disease.

Option D:

1. An unbalanced diet is the excess or deficiency of any diet part or a combination of them.
2. An unbalanced diet can cause an imbalance between the body elements hence leading to diseases.
3. But a cataract is not caused due to unbalanced diet.

Final answer: Cataract is caused by ultraviolet rays.