Certified Paraoptometric (CPO) Practice Exam 2025

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What is the onset of action for Cyclopentolate compared to Tropicamide?

Cyclopentolate acts faster
Tropicamide acts faster
Both have the same onset
Cyclopentolate has a slower onset

The correct answer is: Tropicamide acts faster

The correct answer highlights that Tropicamide has a faster onset of action compared to Cyclopentolate. Tropicamide typically begins to work within 20 to 30 minutes after instillation, making it effective for quick dilation purposes, particularly in situations like routine eye exams. On the other hand, Cyclopentolate tends to take longer to reach its maximum effect, usually requiring 30 to 60 minutes for optimal pupil dilation. This slower onset can make Cyclopentolate less desirable in situations where rapid results are needed. Thus, when comparing the two, the quicker action of Tropicamide is significant for its use in clinical settings, especially when immediate dilation is required.