Posted: July 11th, 2017
An auto mechanic accidentally has battery acid splashed in his eyes. His coworkers irrigate his eyes with water for 20 minutes, and then take him to the emergency department of a nearby hospital, where he receives emergency care for the corneal injury. The physician prescribes dexamethasone (Maxidex Ophthalmic Suspension), two drops of 0.1% solution to be instilled initially into the conjunctival sacs of both eyes every hour; and polymyxin B sulfate (Neosporin Ophthalmic), 0.5% ointment to be placed in the conjunctival sacs of both eyes every 3 hours. Dexamethasone exerts its therapeutic effect by:
A. Increasing the exudative reaction of ocular tissue.
B. Decreasing leukocyte infiltration at the site of ocular inflammation.
C. Inhibiting the action of carbonic anhydrase.
D. Producing a miotic reaction by stimulating and contracting the sphincter muscles of the iris.
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