I don't know about detached retinas but I've been careful to use ear plugs, then ear muffs, than both, then both with better ear muffs, since I was 16 whenever I shot anything more than a .22 (except when hunting).
Now, in addition to the gradual loss of hearing as frequency increases, I have a sharp dip at 4000 Hz, caused by shooting. I'll be getting hearing aids this month.
In addition, I had a very old 12 gauge Model 12 that had a pointy toe on the stock. I could not shoot 25 shots of low-base loads without making my shoulder black and blue.
