Abstract Background The aim of this work is to investigate the biocompatibility and staining properties of DSS: 3, 3′-Di-(4-sulfobutyl)-1, 1, 1′, 1′-tetramethyl-di-1 H-benz [e] indocarbocyanine (DSS). Methods Dye concentrations of 0.5, 0.25, and 0.1% were evaluated (290 and 295 mOsm). Toxicity was assessed using a colorimetric test measuring the inhibition of ARPE 19 cell, human primary RPE cell, and human Müller cell ...