My dad had been just letting his cataracts go, since he's the stereotypical stubborn person who doesn't like to go to the doctor till it's too late. So, one morning he woke up and panicked because he was effectively blind.
He somehow managed to get a hold of my sister (I was away from home; she lived in the same neighborhood luckily) who helped him get an appointment for LASIK. Long story short, he ended up with nearly 20/20 vision afterwards.
https://www.aao.org/eye-health/diseases/what-is-cataract-sur...
My Dad says shit that he makes up in his own head by reinterpreting what others have told him and I just believe him without bothering to verify unless I know it's incorrect; and even then sometimes I just don't bother.
For instance, in this case he probably saw or heard the term LASIK so much by advertising that it just stuck in his head and he glazed over whatever the doctors were telling him when he went in, and he's been repeating that same thing ever since. I believed him, because I don't have eye problems and was never curious enough to look further.
Shame on me.
Your dad sounds like one of these annoying non-technical people who hears one technical term (e.g. LASIK) and then applies that in blanket fashion to anything remotely related. He probably calls Android phones "iPhones", and he probably calls laptop computers "iPads", and he probably calls the Internet "AOL".