Efficiency evaluation of the New Cold Cornea Storage Medium with Dissolvable Antifungal Tablet

Purpose: Cold storage is the standard for corneal preservation method in the U.S., but none of the three U.S. Food and Drug Administration-approved media contains antimycotics. The aim of this study to evaluate antimycotic activity of the first cold storage medium with dissolvable tablet contained Amphotericin B (Kerasave, ALCHIMIA, S.r.l., Italy)(pending FDA approval), and compare the effect of Kerasave versus Optisol-GS on endothelial cell density and corneal transparency.

Materials: Six not-suitable-for-transplant donor corneoscleral rims prepared at Lions Eye Institute for Transplant and Research, Tampa,USA were contaminated by aqueous suspension of Candida Albicans (clinical isolate) prepared to a value of 0.52 on the McFarland Scale of optical turbidimetry and incubated in Kerasave at 4°C. Two additional donor corneoscleral rims remained unaltered in Optisol-GS as control. Kerasave antifungal efficiency was performed by creation and following assessment of Sabouraud agar plates on days two (2), six (6), ten (10), fourteen (14), and sixteen(16). Endothelial cell density and corneal transparency were measured by specular microscope, slit lamp, back light microscopy and OCT after 3, 7 and 14 days of storage at 2-8°C.

Results: Six experimental specimens grew out an average colonies as follows: showed growth too numerous to count on Day 2 (from the Day 0 plating), eleven (11) colonies on Day 6 (Day 4 plating), three (3) colonies on Day 10 (Day 8 plating), and no growth from plating on Day 12 and Day 16. No significant difference in Kerasave vs Optisol-GS corneal cell density and corneal transparency after 3,7 and 14 days of storage.

Conclusion: Addition of Amphotericin B dissolvable tablet into cornea storage media demonstrates effective consistent decrease in fungal contamination compared to control and biocompatibility with donor corneas.