BIOD152 EXAMS SET COMPLETE SOLVED
QUESTIONS AND CORRECT ANSWERS
CERTIFICATION REVIEW
●● the posterior portion of the outer fibrous layer of the eye is called the
Answer: sclera
●● what portion of the eye supplies blood supply to the other layers of
the eye?
Answer: choroid (of the middle layer)
●● true or false: the more numerous type pf photo receptors are rods.
Answer: true
●● what is the correct order of how light passes through the eye?
Answer: cornea, lens, vitreous fluid, retina
●● a patient is found to have blindness of the right visual field of both
eyes. what part of the vision pathway was most likely damaged? explain
your response.
Answer: Left LGN
all sensory information from the right visual fields travels together after
optic chiasm to the left side of the brain.
, ●● a patient is found to have blindness in the right eye. what part of the
vision pathway was most likely damaged? explain your repsonse.
Answer: right optic nerve. information from the right visual has not yet
crossed the optic chiasm. both peripheral and nasal fields of the right eye
would be missing.
●● true of false: all sensory information from the optic nerves cross at
the optic chiasm.
Answer: false
●● what is controlled by the abducens nerve?
Answer: lateral rectus
●● your elderly patient is discussing her vision problems. she describes
her vision as blurry. following a visual examination, her left eye deviates
medially when looking straight ahead. what is most likely causing the
vision problem? explain your reasoning.
Answer: abducens nerve controls the lateral rectus. damage to the lateral
rectus would cause there to be a muscle imbalance, and the medial rectus
would pull the eye medially when looking straight ahead, causing blurry
vision. (diplopia)
●● Match the numbers (1-5) in the figure below with the correct terms
(A-H).
QUESTIONS AND CORRECT ANSWERS
CERTIFICATION REVIEW
●● the posterior portion of the outer fibrous layer of the eye is called the
Answer: sclera
●● what portion of the eye supplies blood supply to the other layers of
the eye?
Answer: choroid (of the middle layer)
●● true or false: the more numerous type pf photo receptors are rods.
Answer: true
●● what is the correct order of how light passes through the eye?
Answer: cornea, lens, vitreous fluid, retina
●● a patient is found to have blindness of the right visual field of both
eyes. what part of the vision pathway was most likely damaged? explain
your response.
Answer: Left LGN
all sensory information from the right visual fields travels together after
optic chiasm to the left side of the brain.
, ●● a patient is found to have blindness in the right eye. what part of the
vision pathway was most likely damaged? explain your repsonse.
Answer: right optic nerve. information from the right visual has not yet
crossed the optic chiasm. both peripheral and nasal fields of the right eye
would be missing.
●● true of false: all sensory information from the optic nerves cross at
the optic chiasm.
Answer: false
●● what is controlled by the abducens nerve?
Answer: lateral rectus
●● your elderly patient is discussing her vision problems. she describes
her vision as blurry. following a visual examination, her left eye deviates
medially when looking straight ahead. what is most likely causing the
vision problem? explain your reasoning.
Answer: abducens nerve controls the lateral rectus. damage to the lateral
rectus would cause there to be a muscle imbalance, and the medial rectus
would pull the eye medially when looking straight ahead, causing blurry
vision. (diplopia)
●● Match the numbers (1-5) in the figure below with the correct terms
(A-H).
