Exam-style question
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Explain the process of accommodation in the human eye.
Model answer
What a good answer should say
- Accommodation is the process by which the eye adjusts the focal length of the lens to focus on objects at varying distances.
- When viewing a nearby object, the ciliary muscles contract, allowing the lens to become thicker and more curved, increasing its optical power.
- Conversely, when looking at distant objects, the ciliary muscles relax, causing the lens to flatten and decrease its optical power.
Explanation
Why this works
This answer demonstrates a clear understanding of the physiological mechanism of accommodation, linking the role of ciliary muscles and lens shape to the focusing ability of the eye. It tests the student's grasp of how the eye adapts to different viewing distances.
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