[Increase in the lumen of Schlemm's canals with increase in ultraocular pressure]

The lumen of Schlemm's canal increases "in vivo" and in experiments on cadaver eyes, with the increase of intra-ocular pressure. It is accepted that the trabecular structures are extended with the raise of inra-ocular pressure. The relation of "in vivo" measurements of the canal with the intra-ocular pressure does not allow any conclusions to be drawn about localisation of outflow obstructions. The viriations of the obtained values is an expression of structural differences in the canal lumen.