What does punctate staining on fluorescein indicate?

What does punctate staining on fluorescein indicate?

• A. Multifocal epithelial cell loss without a complete epithelial defect
• B. Corneal ulceration with complete epithelial defect
• C. Conjunctival hyperemia
• D. Retinal detachment

Answer: (A)

Fluorescein only penetrates where the corneal epithelial barrier is compromised. Punctate staining represents tiny, discrete areas where the epithelium is damaged but not entirely missing over a large area. This pattern fits with multifocal epithelial cell loss without a complete epithelial defect—small microerosions scattered across the cornea rather than a full-thickness epithelial break. In contrast, a full epithelial defect or ulcer would show a larger, continuous area of staining; conjunctival hyperemia is a vascular sign and not about corneal epithelial integrity; retinal detachment pertains to the posterior segment and isn’t assessed by corneal fluorescein staining.

Fluorescein only penetrates where the corneal epithelial barrier is compromised. Punctate staining represents tiny, discrete areas where the epithelium is damaged but not entirely missing over a large area. This pattern fits with multifocal epithelial cell loss without a complete epithelial defect—small microerosions scattered across the cornea rather than a full-thickness epithelial break. In contrast, a full epithelial defect or ulcer would show a larger, continuous area of staining; conjunctival hyperemia is a vascular sign and not about corneal epithelial integrity; retinal detachment pertains to the posterior segment and isn’t assessed by corneal fluorescein staining.