It makes things far less clear (15)
I believe the answer is:
nearsightedness
This could be a double definition.
'it makes' is the first definition.
The definition suggests a singular noun which matches the answer.
'far less clear' is the second definition.
The definition and answer can be both states of affairs as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'things' is the link.
Can you help me to learn more?
I've seen this clue in The Daily Express.
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