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.