Society and pop culture paint a picture of the smartest, most intelligent people (nerds) wearing thick glasses and rocking pocket protectors. Admittedly, I would normally advise against buying into stereotypes, but there may actually be some validity to this particular generalization.
Studies looking at myopia (nearsightedness) have found that the more educated a person is, the more likely they are to have myopia [1, 2]. Another study showed a correlation between myopia and time spent reading in children. This correlation may indicate that "close work", including reading or any other activity that requires the eyes to focus on some nearby object, results in myopia. Of course, correlation does not necessarily indicate causation, but the theory reconciles the two aforementioned findings nicely. If increased reading causes myopia, it is not surprising that a higher degree of education is associated with an increased likelihood of myopia as more educated people probably tend to read more.
Now, why do nerds wear pocket protectors?