Effect of long-term weightlessness on retina and optic nerve in tail-suspension rats.

Aim: To evaluate the effect of long-term weightlessness on retina and optic nerve in tail-suspension (TS) rats.

Methods: A stimulated weightlessness model was established by suspending rats' tail. After 12wk, the ultrastructure and the number of optic nerve axons were observed by transmission electron microscope.