Even when one puts steady pressure on the eyes for a brief time, vision becomes blurry and distorted. In the real world, rubbing the eyes too hard can lead to damaged cornea, and in worst cases, one would need a cornea transplant to restore their eyesight. While not much is known regarding this, as there are only a few instances where Star Wars reconnects with creatures frozen in carbonite, like Han and Mythrol, the loss of eyesight, in particular, could have something to do with the eyes being put under extreme external pressure. Temporary blindness is one of the symptoms of the condition, and so is exhaustion, weakness, dehydration, dizziness, and memory loss. First mentioned in the original trilogy, hibernation sickness or carbon sickness is a medical state a creature would be in once they are taken out being suspended animation in carbonite.