A student looks at a nearby book after first looking at a distant object. Which change helps the eye focus on the book?
Correct answer: B. The ciliary muscles contract and the lens becomes more rounded
- A. The ciliary muscles relax and the lens flattens
- B. The ciliary muscles contract and the lens becomes more rounded
- C. The pupil closes and the retina moves forward
- D. The optic nerve shortens and the cornea becomes opaque
Explanation
For near vision, ciliary muscle contraction reduces tension on the suspensory ligaments, allowing the lens to become more rounded and increase its refractive power. Pupil constriction may also occur, but it is not the main focusing change.
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About Nervous System and Special Senses
The nervous system covers neurons, neuroglia, nerve impulses, synapses, reflex arcs, and the organization of the central and peripheral nervous systems. It also explains the autonomic divisions and the receptors and pathways for vision, hearing, balance, taste and smell, distinguishing sensory reception from conscious perception.
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