Blindness was the condition of lacking visual perception due to physiological or psychological factors. There were varying degrees of blindness, ranging from minor visual impairment to total loss of eyesight.
Blindness in humans Edit
Ada Gillyflower was blind from her mother, Winifred's, experiments with red leech poison to create an antidote from the toxins. Winifred claimed that she was blinded by her father in a drunken rage. (TV: The Crimson Horror)
Parkinson was a blind vicar who lived in Shoreditch in 1963. He prepared a grave for the Hand of Omega at the request of the First Doctor, and later presided over the burial of the coffin containing the Hand at the request of the Seventh Doctor. He stated to the Doctor that he had noticed the Doctor's voice had changed since they last met, to which the Doctor replied, "Yes it has changed, several times". (TV: Remembrance of the Daleks)
Blindness in other species Edit
Davros was left blind after he was crippled in a Thal attack. (AUDIO: Davros, Corruption) He was later able to see via a cybernetic third eye embedded in the middle of his forehead. (TV: Genesis of the Daleks)
Daleks could be blinded if their eyestalk was destroyed or if the lens was covered. (TV: "The Escape", Destiny of the Daleks, Resurrection of the Daleks, Revelation of the Daleks, Remembrance of the Daleks, The Parting of the Ways)
Some species were naturally blind. The Cimmerian race was totally blind and had no concept of either sight or eyes. They accidentally blinded Orllensa, Mike Ferras and Haliard, but later healed them. (AUDIO: Embrace the Darkness) Slithergees were also blind. (AUDIO: Flip-Flop) The Masters of Dorada lost the organs for sight and hearing when they became disembodied brains, but could still sense others' thoughts. (PROSE: The Dream Masters)