Briefly describe how the ciliary muscle, suspensory ligaments and the lens shape change when the eye accommodates for a near object.
Answer
Ciliary muscle contracts, suspensory ligaments relax, lens becomes thicker increasing refractive power.
The correct answer is Ciliary muscle contracts, suspensory ligaments relax, lens becomes thicker increasing refractive power. — A thicker lens provides greater refractive power, enabling accommodation.
Step-by-step solution
- When focusing on a near object the eye must increase its refractive power.
- The ciliary muscle contracts, reducing tension on the suspensory ligaments.
- The suspensory ligaments relax, allowing the lens to become more convex (thicker).
- A thicker lens provides greater refractive power, enabling accommodation.
Common mistake: Reversing the contraction/relaxation of the ciliary muscle and ligaments
Concept tested: Accommodation mechanics
Published · How this solution was prepared and checked
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