I first played Little League baseball at age 11. My batting average was an underwhelming 0.037. Before the next season, my mild myopia was corrected. That year I batted 0.395. Sure, some of it was just being a year older but I think the major cause of the improvement was the glasses. The other memory I have was walking from the optometrist’s office with the new glasses and seeing individual leaves on trees, rather than just a green blur.