I just got done reading The Sports Gene by David Espstein. The books looks at how science is helping to understand and find great athletes. It had a couple of sections on baseball players with some interesting quotes for future reference. The first quote deals with the great eye sight baseball players inherit:
Over 4 years of testing, and 387 minor and major league players, Rosenbaum and his team found an average visual acuity around 20/13. Position players…had better vision than pitchers, and major league players had better vision than minor leaguers. Major league position players had an average right eye visual acuity of 20/11 and an average left eye visual acuity of 20/12. In the test of fine depth perception, 58 percent of the baseball players scored “superior,” compared with 18 percent of a control population. In tests of contrast sensitivity, the pro players scored better than collegiate baseball players had in previous research, and collegiate baseball scored better than young people in the general population. In each eye test, pro baseball players were better than nonathletes, and major league players were better than minor league players. “Half the guys on the Dodger’s major league roster were 20/10 uncorrected,” Rosenbaum says.
The two largest population studies of visual acuity, one from India and one from China, give a sense of just how rare 20/10 vision might be. In the Indian study, out of 9411 tested eyes, one single eye had 20/10 vision. In the Beijing Eye Study, only 22 out of 4438 eyes tested at 20/17.
The next quote deals with baseball players taking ADHD