Is V blind?
The film makes several suggestions that V is blind and benefits from enhanced senses like Marvel's Daredevil. When he emerges from the fire, Delia says he looked at her, but not with eyes, as he had no eyes. Obviously he seems to have no eyes behind the mask, but the citizens wearing the mask throughout the film also have no visible eyes. This could be a screen behind the mask for style purposes, although shots of V putting on the mask show that it has no screen behind the eyes and mouth. V does seem to be wearing a skimask/hood behind his mask, though. In the scene where V is disguised as a police officer and kidnaps Evey, he is wearing a burn prostethic behind the ski-mask and if you look closely, he seems to have large blacked eyes, similar to Hellraiser Cenobites. In the scenes where V emerges from the burning ruins of Larkhill, the closeup of his face also reveals his eyes to be "black". Also while in disguise later as Brookewood(or whatever), he is wearing a pair of shades. This could be for one of two reasons: To disguise his black/missing eyes, or to make rectal identification impossible. 

I believe V is either blind or has mutated pupils. It is possible that he sees in a sort of thermal or enhanced vision, lending to his quick reflexes and ability to predict movements in his enemies. 

I also think it is possible that his eyes are turned black for unspecified reasons, which is what Delia meant when "there were no eyes". The blacking of the eyes in the various scenes also could have been an editing choice for scene enhancement reasons.