Which drug is a cycloplegic agent?

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Prepare for the Certified Paraoptometric Assistant (CPOA) Exam. Study with extensive flashcards and multiple choice questions with explanations. Enhance your skills and knowledge to succeed.

Multiple Choice

Which drug is a cycloplegic agent?

Explanation:
Cycloplegic drugs temporarily paralyze the ciliary muscle to stop accommodation and dilate the pupil. Cyclopentolate does this by blocking muscarinic receptors in the iris and ciliary body, producing both cycloplegia and mydriasis, which is exactly what a cycloplegic agent is meant to do. The other options don’t cause cycloplegia: phenylephrine dilates the pupil by stimulating alpha receptors but doesn’t affect the ciliary muscle; latanoprost lowers intraocular pressure by increasing outflow of aqueous humor; timolol reduces aqueous humor production. So cyclopentolate is the cycloplegic agent.

Cycloplegic drugs temporarily paralyze the ciliary muscle to stop accommodation and dilate the pupil. Cyclopentolate does this by blocking muscarinic receptors in the iris and ciliary body, producing both cycloplegia and mydriasis, which is exactly what a cycloplegic agent is meant to do. The other options don’t cause cycloplegia: phenylephrine dilates the pupil by stimulating alpha receptors but doesn’t affect the ciliary muscle; latanoprost lowers intraocular pressure by increasing outflow of aqueous humor; timolol reduces aqueous humor production. So cyclopentolate is the cycloplegic agent.

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