SharpkopLife Sciences P1 · Human eye and visual defects
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CORNEAL SCARRING AND SIGHT
The cornea is the clear, dome-shaped front layer of the eye. It is made of orderly layers of collagen fibres that are evenly spaced, which lets light pass straight through. After a deep injury or infection, the collagen fibres in the damaged area are replaced by tough, disorganised scar tissue. The scar tissue is cloudy and white instead of clear. Scars are most common in people who work with sharp tools or who wear contact lenses without cleaning them properly.
2.3.25 marks
Use information in the passage to explain how a corneal scar can lead to loss of vision.
NSCBased on Nov 2024 · Paper 1 · Q2.3.2
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