In an ophthalmic surgical procedure, the surgeon wanted to constrict the pupil using a miotic drug. However, he accidentally used another drug that caused dilation of the pupil. There was an absence of light reflex observed in this patient after instilling the same drug. Which drug was most likely used? Explain your answer. A. Neostigmine B. Homatropine C. Phenylephrine D. Pilocarpine E. Morphine
Added by Carl F.
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Step 1: Morphine is a drug that causes dilation of the pupil by disrupting the parasympathetic innervation in the iris. Show more…
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QUESTION 46 Which of the following drugs, if administered as eye drops, would result in dilation of the pupil and allow more light to hit the retina? a. A sympathetic agonist b. A parasympathetic antagonist c. A parasympathetic agonist d. A sympathetic antagonist e. Either A or B would work QUESTION 47 Which of the following effectors is dual-innervated? a. Sweat glands b. Adrenal medulla c. Cardiac muscle d. Smooth muscle in blood vessels e. All of the above are dual-innervated QUESTION 48 Which of the following structures does NOT refract light entering the eye? a. cornea b. lens c. choroid (blood supply behind retina) d. aqueous humor e. vitreous humor
Madhur L.
When an ophthalmologist surgically corrects a patient's vision through LASIK or PRK, the doctor is making adjustments to the patient's a. cornea. c. retina. b. lens. d. iris.
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