What is the purpose of using fluorescein dye in eye examinations?

• A. To illuminate the retina for better visualization
• B. To detect corneal abrasions and foreign bodies
• C. To measure intraocular pressure
• D. To evaluate color vision

Answer: (B)

Fluorescein dye is primarily used in eye examinations to detect corneal abrasions and foreign bodies. When fluorescein is applied to the surface of the eye, it highlights areas of disruption in the corneal epithelium, allowing for better visualization of abrasions, scratches, or foreign materials. Under a blue light during the examination, areas with damage or foreign particles will appear bright green, making it easier for the optometrist to diagnose issues related to the cornea. This capability is critical for promptly addressing injuries or conditions affecting the corneal surface, ensuring appropriate treatment and management.

The other options do not accurately represent the primary function of fluorescein dye. For instance, fluorescein is not used to illuminate the retina, measure intraocular pressure, or evaluate color vision, as these require different techniques and tools.