Q1. [1] medium thorough-understanding
Which of the following correctly describes the cause of myopia?
(A) The eyeball is too short, causing the image to form behind the retina.
(B) The ciliary muscles become permanently relaxed, reducing the lens curvature.
(C) The focal length of the eye lens is too long, so the image of nearby objects falls behind the retina.
(D) The eyeball is elongated or the eye lens is too curved, causing the image of distant objects to form in front of the retina.
- A The eyeball is too short, causing the image to form behind the retina.
- B The ciliary muscles become permanently relaxed, reducing the lens curvature.
- C The focal length of the eye lens is too long, so the image of nearby objects falls behind the retina.
- D The eyeball is elongated or the eye lens is too curved, causing the image of distant objects to form in front of the retina.
Generated by claude-sonnet-4-6 · 2026-06-26 01:08 · grounding rag
Model Answer
(D) The eyeball is elongated or the eye lens is too curved, causing the image of distant objects to form in front of the retina.
Explanation
The passage clearly states myopia arises due to (i) excessive curvature of the eye lens or (ii) elongation of the eyeball, and the image of a distant object forms in front of the retina. Option A and C describe hypermetropia; Option B describes presbyopia. Only D matches the textbook definition exactly.