some critics also use the blindness theme in its entirety rather than specific scenes to support an absurdist/nihilist reading - for example, you might say that at the start Lear is blinded to the truth of his reality by his own ego and sense of self, however, through the trials of the play and with the death of Cordelia, Lear realises that he has been blind to the nature of reality - that everything he did was pointless etc. However, if you chose to look at it this way, you'd have to add to it by showing how specific scenes and techniques in a certain production made this clear.