I had occasional lazy eye and went to an eye exam as a kid, which didn't give me any useful info. In my 20s a friend performed an eye exam on me and diagnosed m

I had occasional lazy eye and went to an eye exam as a kid, which didn't give me any useful info. In my 20s a friend performed an eye exam on me and diagnosed me with astigmatism in my left eye. Since my right eye was seeing much better than the left, my brain would essentially not take care of the left one as much and not move it in sync. Glasses fixed it. As a side effect of the astigmatism, I did not have stereoscopic vision for most of my life, and thus terrible depth perception. A few days after getting glasses, my brain adapted, and I saw the world in 3D for the first time. It was like getting an going from an old school TV to 4K - there was so much detail in the world that I could not see until now. I still don't see 3D movies in 3D, but that's not something I miss.