Several characters are described, or describe themselves, as blind in some form. For example, Jaime is described by Cersei as "blind as Robert", by Tyrion as a "poor, stupid, blind, crippled fool". Physically, he is blinded in a joust with Sandor when his helm is dented, he rides a half-blind horse when he journeys with Brienne, and suffers blinding pain both when he is loses his fight with Brienne and when he loses his hand. Other (living) characters described as blind are Cersei, Victarion, Brienne, Thoros, Edmure, Bran and Arya.
On the other hand, Doran describes himself as "not blind, nor death" to his sand snakes. Similarly, other characters to promote themselves as not blind are Sam, Val, old Walder, Stannis, while Gilly, Mance, Daario and Merris are described as not blind.
One critical interpretation is that blindness equals death. Several dead bodies and carcasses are found and described as blind e.g. the mother direwolf, Desmond, the garrons on the Fist. Conversely, several characters who were described as blind in some sense, for example Robert, Ned, Renly, Joffrey, Balon. It would seem that being described as blind can be foreshadowing of death for some characters. For example Cersei seems set to die (she is on Arya's list) and is increasingly described as blind. For example, as she takes her walk of shame she convinces herself "I am blind and deaf". She also asks "how could I have been so blind for so long?" Conversely, none of the characters to be described as not blind have died yet.
Another interesting relationship is between blindness and faith. Arya becoming blind is part of her training, and brings her closer to the Many-Faced God. Bran must shut his "blind two" eyes, and open his third eye. Cersei declares that "the gods are blind" and Asha describes her Drowned God as blind. It appears that blindness can also lead to faith.
There also may be a relationship between 'dark blind' and 'light blind'. Several characters are blinded by lightning (Jon), rays of sunlight (Sansa, Bran, Sam, Danaerys, Jon), or the reflection from snow (Sansa). Conversely, other characters are blinded by the depths/ darkness (Arya, Victarion, Davos, Tyrion). Some are also blinded by pain (Jaime, Brienne, Arya) alcohol (Grenn, Jon) or some kind of water (e.g. tears, rain): Sansa, Tyrion, Sam, Arya, Brienne).
Some characters are able to blind others in some fashion e.g. physically, by using light: Jaime, Margaery, Loras, Stannis, Danaerys, Arya, Sandor, Davos, the Weeper. Also, there is an interesting mention of blind white fish in a black river in Bran's POV. I haven't found any kind of pattern in this, but it is interesting.
Interesting characters include the likes of Danaerys, who describes herself initially as "neither deaf nor blind" and not "blind to such things" as a lady would be. She then tries to avoid being blind, she "does not mean to strike out blind again" from Vaes Tolorro. In Mereen she says "she was so blind". Davos used to serve the "Blind Bastard" who was neither blind nor a bastard. He is blinded by mud as he swims under the chain, and thinks he is "god-blind" whilst in a cell with Manderly. Yet he doesn't seem to be so clear cut.
Tyrion is also interesting. He says "I am short, not blind" to Jon at the wall. His more recent POV's seem to be littered with references to blindness, though.
Interestingly, almost every house or entity seems to have a blind charge:
Stark - Arya (temporarily)
Tully- Norbert Vance
Baratheon - a blind soldier in Melissandre's care
Greyjoy - Beron Blacktyde
Arryn - Marillion (briefly)
Martell - Seneschal Ricasso
Tyrell - Ben Beesbury
Targaryen - Drogo (blind before he died. Alternately Aemon)
Faceless Men- a young acolyte
Brotherhood - Wyl (presumably)
Littlefinger has a dog on the fingers
Qarth - Sybassion
Wildlings - Doss
Given this it seems strange that the Lannisters are short a blind member. Could this become Tyrion?
Edit: Removed some off topic stuff.
Edited by Cressen's Fury, 23 August 2013 - 01:29 AM.