Full Idea
There is a phenomenal difference between a short-sighted person wearing glasses and not; they do not judge that the world is different, but the properties of the experience (the qualia) have changed.
Clarification
'Phenomenal' refers to the raw quality of experience
Gist of Idea
If someone removes their glasses the content of experience remains, but the quality changes
Source
Tim Crane (Elements of Mind [2001], 5.43)
Book Reference
Crane,Tim: 'Elements of Mind' [OUP 2001], p.143
A Reaction
Could be challenged. If a notice becomes unreadable, that is more than the qualia changing.