Corrected entry: They continue to show the effects of the radiation slowing the ageing of the planets' population and making the entire enterprise crew feel younger, and I believe there was a statement about old scars healing. Now that's fine enough but Geordi was born blind, as explained in one episode. He was not blinded in a accident or anything like that. Reverse ageing should have no effect on his eyes because he never had them in the first place so therefore nothing to regenerate.
Rlvlk
7th Dec 2005
Correction: It is not simply reversing the ageing process: it is healing the body. It just happens that a person's prime physical condition comes in that 18-25 years old range. Geordi's optic nerves never reached his eyes and "healing the body" would fix that.
Rlvlk