AI-generated practice question — model-generated for extra practice, not a previous-year CBSE board question.
Presbyopia is an age-related defect where the near point recedes, making nearby objects blurry. It is caused by gradual weakening of ciliary muscles and diminishing flexibility of the eye lens.
For a 1-mark question, examiners expect: (1) a brief definition/symptom and (2) the two structural causes — weakened ciliary muscles and reduced flexibility of the eye lens. Both causes must be mentioned to score full marks; the definition alone is insufficient.