Fluorescein dye is used to highlight corneal epithelial defects during slit lamp examination.

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Study for the NBEO Ocular Disease Part 1 Test. Use flashcards and multiple choice questions, each with hints and explanations, to prepare for your exam! Get ready for your success!

Multiple Choice

Fluorescein dye is used to highlight corneal epithelial defects during slit lamp examination.

Explanation:
Fluorescein highlights corneal epithelial defects because it stains areas where the epithelial layer is disrupted. Intact epithelium acts as a barrier and resists dye uptake, while abrasions, erosions, or ulcers let the dye pool and reveal the defect. When viewed with a slit lamp using blue (cobalt blue) illumination, fluorescein emits a bright green-yellow fluorescence, making the edges and extent of the defect easy to see. This technique is specifically used to assess corneal surface integrity and tear-film-related changes, and it would be incorrect to say it’s not useful for this purpose.

Fluorescein highlights corneal epithelial defects because it stains areas where the epithelial layer is disrupted. Intact epithelium acts as a barrier and resists dye uptake, while abrasions, erosions, or ulcers let the dye pool and reveal the defect. When viewed with a slit lamp using blue (cobalt blue) illumination, fluorescein emits a bright green-yellow fluorescence, making the edges and extent of the defect easy to see. This technique is specifically used to assess corneal surface integrity and tear-film-related changes, and it would be incorrect to say it’s not useful for this purpose.

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