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Thaler, S. et al.

Sebastian Thaler, Frank Schuettauf, Michal Fiedorowicz, Andre Messias, Andreas Schatz, Tomasz J. Choragiewicz, Christian A. May, Eberhart Zrenner, Anselm Kampik, Christos Haritoglou,

In vivo toxicity testing of methyl blue and aniline blue as vital dyes for intraocular surgery.

PURPOSE: To investigate the biocompatibility of methyl blue and aniline blue as vital dyes for vitreoretinal surgery in an in vivo rat model and to evaluate the effect of these dyes on retinal structure and function. METHODS: Adult Brown-Norway rats received intravitreal injections of 0.1%, 0.2%, and 2% methyl blue or aniline blue dissolved in balanced salt solution with balanced salt solution serving as a control. Retinal toxicity was assessed 7 days thereafter by means of retinal ganglion cell counts, light microscopy, and electroretinography. RESULTS: No significant decrease in retinal ganglion cell counts at concentrations up to 0.2% was observed. At 2%, however, a significant retinal ganglion cell loss was detected with both dyes (more pronounced for aniline blue). Light microscopy showed no structural changes in the central retina for concentrations up to 0.2%. Electroretinographies detected no adverse effects of methyl blue or aniline blue on rod- or cone-driven responses at concentrations up to 0.2%. CONCLUSION: Methyl blue and aniline blue are very biocompatible and may, therefore, be usable for intraocular surgery. Further testing with other animal models will be necessary to confirm this. The safety margin of methyl blue is possibly higher than that of aniline blue.[1]

References

In vivo toxicity testing of methyl blue and aniline blue as vital dyes for intraocular surgery. Thaler, S., Schuettauf, F., Fiedorowicz, M., Messias, A., Schatz, A., Choragiewicz, T.J., May, C.A., Zrenner, E., Kampik, A., Haritoglou, C. Retina (Philadelphia, Pa.) (2009) [Pubmed]

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