According to the BBC, volunteers in a Brazilian study were tested for glaucoma and neurological problems. The test checked peripheral vision by gradually projecting different shapes onto the same color background – like a white square on a white field. And the patient had to press a button when they could see the shape.
Half of the patients listened to 10 minutes of Mozart before the test – specifically Mozart's Sonata for Two Pianos. And they did much better than volunteers who waited for the test in silence.

It may be due to something called “the Mozart Effect.” Certain music primes the human brain to think, which improves our ability to focus and reason – and Mozart’s music seems to fit the bill the best. In fact, his music has already been associated with improving mathematical skills, producing smarter babies, and enhancing learning among college students.

So, add “eye exam” to the list of things that’ll improve if you listen to Mozart first.