Astigmatism

It is known that, over the years, astigmatism changes. It changes from what is called “with-the-rule astigmatism” to “against-the-rule astigmatism.”

Who made up “the rule,” anyway? I don’t know. =)

Dr. Ken Hayashi and colleagues published a study in the July 2024 edition of the journal Cornea that showed that, at least in a Japanese population, the change from with-the-rule to against-the-rule occurred later in very near-sighted people. This matches my experience in the clinic in Minnesota. Of course, I’m not sure that that’s any consolation to those folks, since they are so near-sighted anyway!