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Figure 14 shows a cross-section of a human eye - Edexcel - GCSE Biology - Question 7 - 2022 - Paper 1
Question 7
Figure 14 shows a cross-section of a human eye. (a) Cataracts can develop in the eye causing people to have blurred vision. (i) Which structure of the eye can deve... show full transcript
Worked Solution & Example Answer:Figure 14 shows a cross-section of a human eye - Edexcel - GCSE Biology - Question 7 - 2022 - Paper 1
Step 1
Step 2
Describe how cataracts are corrected by surgery.
Answer
Cataracts are corrected by a surgical procedure known as cataract surgery. During this operation, the cloudy lens is removed and replaced with an artificial intraocular lens (IOL). This restores clear vision by allowing light to focus properly on the retina.
Step 3
Explain how the size of the pupil of the eye changes when a torch is shone into the eye of a person.
Answer
When a torch is shone into the eye, the bright light causes the pupil to constrict, or become smaller. This reaction, known as the pupillary light reflex, helps protect the retina from excessive light and improves the eye's ability to focus.
Step 4
Explain why this person cannot see distant objects clearly and how the problem can be corrected.
Answer
The person likely has a condition known as myopia or nearsightedness, where light from distant objects focuses in front of the retina instead of directly on it. To correct this issue, the individual can wear concave glasses, which help to diverge the light rays so that they focus correctly on the retina, allowing for clear vision of distant objects.