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Histology analysis. (b) A control cornea, (b) a sham-treated cornea, (c) a corneal sample exposed to 400-kHz ultrasound, and (d) a corneal sample exposed to 600-kHz ultrasound. The epithelium is the eosinophilic layer, indicated by white arrow, as opposed to much thinner endothelium, which is just a cell layer in thickness, marked with a black arrow. Magnification of × 10 was used.
