Certified Paraoptometric (CPO) Practice Exam 2025

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Prepare for the Certified Paraoptometric Exam with our comprehensive quiz featuring multiple-choice questions. Each question is accompanied by hints and explanations, helping you build your knowledge and confidence. Get ready to excel in your career!

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What is the most commonly used ophthalmic dye that is available in liquid form or on filter strips?

Sodium Fluorescein
Rose Bengal
Indocyanine Green
Lissamine Green

The correct answer is: Sodium Fluorescein

The correct answer is sodium fluorescein, which is the most frequently utilized ophthalmic dye in clinical settings. This dye is particularly popular due to its effectiveness in evaluating the cornea for conditions such as abrasions, foreign bodies, and dry eye syndromes. Sodium fluorescein can be delivered in both liquid form and on filter strips, allowing practitioners flexibility in how they administer it based on patient needs and specific examination requirements. When applied, sodium fluorescein emits a bright green fluorescence under blue light, making it easy to visualize corneal irregularities. This property is crucial for diagnosing and assessing various ocular surface conditions. Other dyes listed, while also used in ophthalmology, do not share the same level of common usage as sodium fluorescein. Rose Bengal and lissamine green, for instance, are useful for staining damaged epithelial cells but are less frequently employed than sodium fluorescein. Indocyanine green is primarily used in retinal imaging and angiography, rather than everyday ocular surface exams. This context highlights why sodium fluorescein stands out as the most commonly used ophthalmic dye.