A college boy 22-yrs comes to you because it is becoming increasing difficult for him to read the newspaper. His vision problem most likely results from an inability to contract which of the following?
A. The irisB. The ciliary body
C. The suspensory ligaments
D. The extraocular muscle
The Answer is B. Contracting the
ciliary body increases the refractive power of the eye for near vision. When
the ciliary muscle contracts, it pulls the suspensory ligaments toward the
cornea, which permits the lens causes the lens surface to bulge, increasing its
refractive power. The muscles of the iris control the size of the pupils, and
the extraocular muscles control the position of the eye in the socket.
