Full Idea
There appear to be qualitative aspects of experience that have no function in the life of the organism. They constitute dysfunction or noise. Blurriness in a visual experience is an example.
Gist of Idea
Some qualities of experience, like blurred vision, have no function at all
Source
Tyler Burge (Philosophy of Mind: 1950-2000 [2005], p.460)
Book Reference
Burge,Tyler: 'Foundations of the Mind' [OUP 2007], p.460
A Reaction
The best account of blurred vision would seem to be adverbial - I see 'in a blurred way' (nay, blurredly). Hence maybe blurred vision is functional, but it just isn't functioning very well.