2. The following are true about pupil reaction to light:
a. secretion of acetylcholine is responsible for pupil
dilatation
b. constriction of the pupil is mediated by nerve fibres
travelling in the short ciliary nerve
c. dilatation of the pupil is mediated by nerve fibres
travelling in the long ciliary nerve
d. the sympathetic nerve innervates the dilator muscles
e. the sympathetic nerve supply to the iris travels through
the cavernous sinus
3. The following are true about the vestibuloocular reflex:
a. it receives input from the semi-circular canal
b. it receives input from the otolith
c. it is suppressed when the object is moving with
the subject
d. it keeps the image stable on the retina
e. is impaired in lesion of the medial longitudinal fasciculus
. 4. The human lens:
a. is innervated by the ophthalmic nerve
b. has a uniform refractive index
c. has a large radius of curvature anteriorly than posteriorly
d. stops growing after birth
e. derives its energy chiefly from anaerobic glycolysis
5. The following are true about the ERG:
a. in infarction of the choroidal circulation the a-wave
of the ERG is reduced or absent
b. the ERG is always abnormal in patients with macular
diseases
c. flicker ERG can be used to isolate cone photoreceptors
d. the b-wave of ERG is reduced in dark-adapted eye
e. the ERG is abnormal in patients with glaucoma