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(9)The eye moves in what are termed “saccades” jerks and rests. In visual searching a saccade/rest cycle usually occupies roughly?
? ? ?
A．0.3 s B．1.0 s C．3 s
正确答案：C
(10)The function of the ciliary muscles in the eyes is to
? ?
A．move the eyes from left to right in the socket B．change the size of the pupil to vary the amount of light entering the eye
?
C．alter the shape of the lens to allow the eye to focus on objects at various distances
正确答案：C
(11)When light passes through the lens it is brought to focus at the back of the eyeball on the
? ? ?
A．retina B．cornea C．iris
正确答案：A
(12)With age increases, the lens of eye generally becomes
?
A．cracked
? ?
B．too stiff C．too elastic
正确答案：B
(13)After been in exposed to normal lighting, dark adaptation (night vision) returns after a recovery period of about
? ? ?
A．30 minutes B．1 hour C．5 minutes
正确答案：A
(14)If a pilot whose eyes have fully adapted to darkness is exposed to a bright flash of light, the time required for dark adaptation to be re-established is most likely to be
? ? ?
A．3 minutes B．15 minutes C．30 minutes
正确答案：C
(15)How long is needed for full dark adaptation?
? ? ?
A．10-20min B．35-45min C．20-30min
正确答案：B
(16)Empty Field Myopia is the tendency of the ciliary muscle to relax when there are no close objects in the field of view. This causes the eye to take up a focal length of approximately
? ? ?
A．one to two meters B．five meters C．infinity
正确答案：A
(17)The part of the eye which ben