We have investigated the effects of 0.02 and 0.2% thymoxamine hydrochloride on the isolated rabbit corneal endothelium. The corneal swelling rate, measured by specular microscopy, indicated that 0.02% thymoxamine caused a swelling rate equal to controls while a 0.2% concentration caused a significantly increased swelling rate (34.1 vs 10.3 microns/h; P less than 0.05). The data suggests that the maximum recommended intracameral concentration of thymoxamine be 0.02% in order to allow a 10-fold safety factor for the corneal endothelium.
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