Any known allergy or prior reaction to fluorescein Any known allergy or prior reaction to fluorescein, iodine, or shellfish To determine any sensitivity to fluorescein, subject must have a skin prick test preoperatively (at the time of the preoperative visit and after signed informed consent for entry into this clinical trial is given); a negative skin prick test to fluorescein is an inclusion criteria Any known allergy or prior reaction to fluorescein; also, a positive skin prick test to fluorescein is considered an exclusion criteria and the patient would not be eligible for entry into this study Allergy to fluorescein Patient must not have a documented reaction to fluorescein (fluorescein sodium)