Certified Paraoptometric (CPO) Practice Exam 2025

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Why are ophthalmic stains significant in eye examinations?

  1. They help in pain relief

  2. They assist in identifying corneal defects

  3. They are used to diagnose systemic diseases

  4. They enhance pupil dilation

The correct answer is: They assist in identifying corneal defects

Ophthalmic stains are significant in eye examinations primarily because they assist in identifying corneal defects. These stains, such as fluorescein and lissamine green, bind to areas of damaged or compromised epithelial tissue on the cornea. When applied during an examination, they provide a visual indication of any abrasions, ulcers, or other irregularities present on the surface of the eye. This aids healthcare professionals in diagnosing various ocular conditions and determining appropriate treatment. While other options, such as pain relief, diagnosing systemic diseases, and enhancing pupil dilation, have their own roles in eye care, they are not the primary functions of ophthalmic stains. Stains do not relieve pain directly, they are not used to identify systemic diseases, and they do not contribute to pupil dilation, as that is specifically achieved through the use of mydriatic agents.

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