What is the main use of fluorescein stain in eye care?

Fluorescein stain is primarily used in eye care to evaluate corneal integrity and detect foreign bodies. This bright orange dye is applied to the eye, where it adheres to areas of the cornea that are damaged or irregular, allowing the clinician to visualize abrasions, ulcers, or foreign bodies under a blue light. The fluorescein stain highlights these areas due to its ability to fluoresce when exposed to a specific wavelength of light, making it easier for eye care professionals to assess the health of the cornea and identify any potential issues that may require treatment.

In contrast, assessments of tear production involve different diagnostic tests, such as the Schirmer test, which directly measures how much tear fluid is produced. Enhancing color vision testing generally involves other specific tests and tools that do not rely on the use of fluorescein stain. Measuring intraocular pressure is typically done through tonometry, which uses methods like applanation or non-contact tonometry, and does not involve fluorescein. Thus, the primary and most pertinent use of fluorescein stain in eye care clearly revolves around corneal evaluation and detection of foreign bodies.