One-year-old Joey's eyes have been crossing whenever he tries to focus on anything close to him. The doctor has told his parents that he has to have glasses immediately and wear them whenever he is awake. Why would the doctor say that?
a. Joey has to get used to wearing glasses as a child in order to wear them later in life.
b. Joey has to wear glasses now so that he won't have to wear them later in life.
c. Joey's eyesight is still developing, and if he doesn't wear glasses during this critical period, his vision could be permanently affected.
d. Joey's doctor is probably an alarmist, and it really isn't that important.
Question 2
Compared with other sensory neurons, such as those that serve mechanoreceptors, Ia sensory fibers are
a. far less commonly found in the human nervous system.
b. less likely to be myelinated in the human nervous system.
c. very large and very fast.
d. very small and slow.
Pekingese's large eyes
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