During the past five years my eyes have been getting rounder.
Vision prescriptions involve three measurements: sphere, cylinder, and axis.
(It sounds like a math test, doesn't it?)
My sphere measurement has remained constant at -0.75 which means I am slightly and unchangingly myopic. I wear my glasses when driving or when I go to a movie. My prescription is minor enough that even glass lenses are light and comfortable, so I always get glass lenses to avoid lens scratches.
My cylinder measurements have decreased, which means my eyes are getting rounder. In 2007 they were -1.00 and -0.75 (right and left eye). In 2009 they were -0.75 and -0.75. Two weeks ago they were -0.5 and -0.5.
The axis measurements have also changed slightly: 172 and 22, then 164 and 20, then 165 and 20.