Matt McIrvin's Freaky Alternate Reality

I recently got new high-refraction-index glasses, which are much thinner than my (not at all thick) previous glasses. Immediately I thought it was a mistake, because though everything was clearer (a small prescription change), walking home at night produced a number of lens artifacts when it came to light sources, namely a visual copy of the lights, probably due to internal reflection or something. I was pissed off. Then I popped on my old pair and discovered that the artifacts there there, too, but I hadn't noticed them in years. Indeed, 4 months after getting new glasses, I no longer notice or think about the artifacts. Thanks evolving brain!