Cornea is damaged in story line (8)
I believe the answer is:
scenario
'story line' is the definition.
(I've seen this in another clue)
'cornea is damaged' is the wordplay.
'damaged' is an anagram indicator.
'cornea'+'is'='corneais'
'corneais' anagrammed gives 'SCENARIO'.
'in' is the link.
(Other definitions for scenario that I've seen before include "In plot of movie, for instance" , "Film treatment" , "Outline -- setting for a novel" , "Projected plan of action" , "Master plan" .)