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122 Questions
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Which of the following is an ABNORMAL intra-ocular pressure measurement?
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  1. 20 3%
  2. 24 91%
  3. 16 2%
  4. 12 2%
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Which of the following is a sign of optic nerve dysfunction?
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  1. Decreased visual acuity 6%
  2. Decreased colour vision 2%
  3. Afferent pupilary defect 9%
  4. All of these 78%
  5. Visual field defect 3%
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Which cranial nerve is responsible for opening of the eyelids?
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  1. CN 6 7%
  2. CN 4 1%
  3. CN 7 22%
  4. CN 3 68%
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Which cranial nerve is responsible for closure of the eyelids?
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  1. CN 6 7%
  2. CN 3 26%
  3. CN 4 3%
  4. CN 7 61%
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Which cranial nerve is responsible for movement of the medial rectus, inferior rectus, superior rectus, and inferior oblique?
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  1. CN 3 93%
  2. CN 7 1%
  3. CN 6 1%
  4. CN 4 3%
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Which cranial nerve is responsible for the movement of the superior oblique?
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  1. CN 4 86%
  2. CN 6 9%
  3. CN 3 2%
  4. CN 7 1%
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Which cranial nerve is responsible for the movement of the lateral rectus?
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  1. CN 4 5%
  2. CN 7 0%
  3. CN 3 3%
  4. CN 6 91%
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How many extra-ocular muscles are there in each eye?
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  1. 6 93%
  2. 5 2%
  3. 8 1%
  4. 4 2%
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There are a number of parts to the lacrimal system. In what order does a tear encounter these, on its passage from the eye to the nose?
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  1. punctum -> cannaliculus -> naso-lacrimal duct -> naso-lacrimal sac -> nose 19%
  2. cannaliculus -> punctum -> naso-lacrimal sac -> naso-lacrimal duct -> nose 16%
  3. punctum -> cannaliculus -> naso-lacrimal sac -> naso-lacrimal duct -> nose 56%
  4. punctum -> naso-lacrimal sac -> naso-lacrimal duct -> cannaliculus -> nose 7%
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Which of the orbital bones is most likely to fracture?
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  1. Maxillary 30%
  2. Zygomatic 20%
  3. Frontal 3%
  4. Ethmoid 45%
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What creates the physiologic blind spot?
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  1. Optic nerve 71%
  2. Macula densa 8%
  3. Fovea centralis 18%
  4. Choroid plexus 1%
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Which of the following is NOT a function of the ciliary body?
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  1. Aids in extraocular movements 80%
  2. Causes the lens to thicken 14%
  3. Produces aqueous humour 0%
  4. Aids in accomodation 4%
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Where is aqueous humor produced?
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  1. Retina 1%
  2. Ciliary body 89%
  3. Choroid 4%
  4. Limbus 4%
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Which of the following is true of the anterior chamber?
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  1. Poster border is the iris and lens 2%
  2. Filled with aqueous humor 4%
  3. All of these 86%
  4. Anterior border is the cornea 6%
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What does the conjunctiva cover?
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  1. Outer eyelids and sclera 1%
  2. Inner and outer eyelids 6%
  3. Inner eyelids and sclera 77%
  4. Sclera and cornea 14%
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Pupil size is NOT determined by which of the following:
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  1. Viewing distance 3%
  2. Parasympathetics 1%
  3. Light 0%
  4. Eye colour 93%
  5. Sympathetics 1%
Topics: ophthalmology
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A hyphema is caused by:
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  1. A Subconjunctival hemorrhage that has bled into the anterior chamber 31%
  2. A retinal tear that is bleeding into the anterior chamber of the eye 12%
  3. A reaction to inflammation, most commonly to a conjunctivitis 4%
  4. Shearing of the iris and ciliary body’s blood vessels 51%
Topics: ophthalmology
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A 34 year old man presents to the ER with numerous lid lacerations after a bar fight. Which of the following is incorrect regarding lid lacerations:
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  1. The attending physician should first ensure there is no open globe injury 15%
  2. If the lower eyelid can be pulled laterally, the lateral canthal tendon has likely been severed 52%
  3. An ophthalmologist should be involved to close lacerations involving the lid margin 22%
  4. Lacerations on the medial side are worrisome due to potential damage to the lacrimal system 9%
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Which is not true regarding chemical burns to the eye:
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  1. Corneal stem cells are located at the center of the cornea. If this area is affected, there is no chance of replacing the damaged cornea with new cells 41%
  2. A white ischemic limbus indicates a poor prognosis 1%
  3. The conjunctiva and its blood vessels can grow over the cornea causing poor vision 8%
  4. Topical antibiotics are an appropriate method of promoting re-epithelialization 35%
  5. Irrigation should continue as long as required to normalize the pH 12%
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Daniel is a 23 year old male that works in a research lab over the summer to pay for his schooling. He often works with an assortment of chemicals and is usually very careful with handling them however neglects to wear goggles as they are too bothersome. One of his co-workers accidentally drops a beaker of acid that splashes into Daniel’s right eye. His first response should be to:
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  1. Measure the pH of the eye to determine the severity of the burn 0%
  2. Use an appropriate alkaline solution to rinse the eye 2%
  3. Apply a wet dressing on the eye and apply pressure 0%
  4. Rush to the nearest ER while maintaining the eye closed 4%
  5. Immediately rinse the eye for 10-15 minutes with plain water 91%
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