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The eye

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Question 52

Figure 1 shows how light rays travel through a healthy eye compared to an eye with a cataract.

A diagram comparing the path of light in two eyes. In the healthy eye, the lens is clear, and parallel incoming light rays are refracted to focus sharply on a single point on the retina. In the eye with a cataract, the lens is shaded grey and labelled 'clouded lens'; parallel incoming light rays strike this lens and are scattered in multiple discordant directions, failing to focus on a single point on the retina.

Explain why a person with a cataract sees an image that is blurry and less clear.

[2]

The eye Questions

  1. GCSE
  2. /Biology
  3. /The eye