Which of the following can injure the retina of the eye?

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Washing our eyes frequently with clear water.

Keeping books very close to the eyes while reading

Using spectacles of incorrect power.

Looking at the sun directly.

answer is D.

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Detailed Solution

Washing our eyes often with clear water, removes unnecessary dust particles from our eyes and keep our eye clean.
Hence it is a good practice to follow. However, we should not rub our eyes while cleaning as it may scratch the cornea of the eye.
Reading from a very close distance and using spectacles with incorrect power can cause a lot of strain on our eye lenses. However, it does not really affect the back of the eye or the retina.
The retina contains several nerve cells that are sensitive to light. Hence, looking at very bright sources like the sun or Laser torch can injure the retina.

Therefore, 'Looking at the sun directly' is the correct response.

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