ABSTRACT: The scleral ossicle rings function has been related to mechanical protection, muscle fixation, support for eyeball shape and visual accommodation. There are few morphobiometric reports on these in different Testudines species, we performed ultrasound (US) computed tomography (CT) of the one green turtle (Chelonia mydas), black-bellied slider (Trachemys dorbigni) red-footed tortoise (C...