Typical example of blurry eye chart page (9)
I believe the answer is:
archetype
'typical example' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for archetype that I've seen before include "Original pattern or model" , "Very characteristic example" , "Model - perfect specimen" , "Original model from which others are copied" , "Very typical example" .)