I'll be the first to admit that my vision is horrible and never has been totally correctable with everyday eyeglasses (soft contacts are worse and I'm not wearing both unless I have to, I can't tolerate hard contacts anymore). Let's remember that I'm the one who claimed to keep trying to put a leash on his sims' toddlers and take them to the park to play fetch while reading stories to their puppies at bedtime. Okay not really, it was a couple of strange looking dogs that I mistook for cats back then. But I think that still falls a bit short of needing to be diagnosed with a cognitive disorder. ;)
An MC Reset on your sim might also trigger a redone thumbnail, but that's a bit more intrusive to gameplay than trying a new outfit or something that appears above the neckline on those thumbnails.