Clue: Pollyanna's visual aid? (4-6,7)
Answer: ROSE-TINTED GLASSES
Explanation: Pollyanna's visual aid? (4-6,7) 
As worn by an optimist.
 
Pollyanna was the eponymous hero of a 1913 children's novel. Her undying optimism has led to her name becoming synonyymous with "optimist".