Text this: Discussion: acoustic density and ocular structures rigidity in healthy individuals and patients with primary open-angle glaucoma (response to the article by Kazemi A., Zhou B., Zhang X., Sit A.J. comparison of corneal wave speed and ocular rigidity in normal and glaucomatous eyes. J Glaucoma. 2021;30(10):932–940. DOI: 10.1097/IJG.0000000000001901)