Order Optical System Of The Eye

Order optical system of the eye
Order 59576534
Order Optical System Of The Eye
These statements concern peripheral and central factors that determine the
appreciation and intensity of pain.
(a) Nerve section leads to a permanent loss of pain sensation.
(b) Referred pain is the term given to the painful sensations that are felt in a
peripheral structure, such as the arm, but which are associated with trauma
to the deep viscera, such as the heart.
(c) Lesions to the thalamus can produce raised thresholds for pain.
(d) Lesions of the frontal lobes of the cerebral cortex alter a person’s attitude
to pain rather than the intensity of the pain.
(e) The groups of naturally occurring peptides known as endorphins and en¬
kephalins influence pain transmission in the CNS.
111 The following statements are about the optical system of the eye:
(a) Most of the refractive power of the eye lies at the air/corneal junction.
(b) In myopia (short-sightedness) the eyeball is too short for good visual acuity
over the normal range of object distances from the eye.
(c) Spectacles with biconcave lenses will correct defects of hypermetropia
(long-sightedness).
(d) Spherical lenses cannot fully correct astigmatism.
(e) Visual acuity is better for central vision than for peripheral vision
he graph shows dark adaptation curves for a human subject going from sun¬
shine into a dark room.
(a) Curve A shows the time course of regeneration of the pigment rhodopsin.
(b) The subject is unlikely to have prolonged vitamin A deficiency.
(c) Dilation of the pupil makes the major contribution to curve A.
(d) The light intensity required for vision is lower in the periphery of the retina
than at the fovea.
(e) The cones are responsible for colour vision.
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