Romans cured cataracts

I watched a show on the history channel which showed evidence that the Romans could cure cataracts and actually performed brain surgery following trauma to the head (soldiers and gladiators). The way they dealt with cataracts was to insert a needle into the eyeball and pushed the lens aside, as it is not necessary for sight. This process is called couching. In addition, skulls were found with perfectly circular holes drilled in their skulls, and the skulls surprisingly showed signs of healing; meaning the patients survived the trauma. Although it cannot be proven that the doctors knew they were releasing the pressure (it is hypothesized that the doctors thought there were evil spirits inside), it is still impressive to be able to successfully perform brain surgery.