What is the best procedure for evaluating a corneal abrasion?

The use of fluorescein stain is the best procedure for evaluating a corneal abrasion because it allows for direct visualization of the damaged area on the cornea. When fluorescein dye is applied, it highlights any areas of epithelial injury or loss, making abrasions appear as bright green areas against the otherwise dark corneal surface. This method is quick, simple, and effectively indicates the presence and extent of the abrasion, guiding further management and treatment.

Tonometry measures intraocular pressure and is more useful in diagnosing conditions like glaucoma, making it less relevant for assessing superficial corneal injuries. Visual field tests are designed to evaluate peripheral vision and would not provide information about corneal health or abrasions. Funduscopy is employed to assess the interior structures of the eye, particularly the retina and optic nerve, but it does not provide insights into corneal surface issues. Thus, fluorescein staining stands out as the most effective procedure for identifying and evaluating corneal abrasions.