Met up with him, But was unable to locate the glasses in all of the muck, unfortunately
I had a similar situation, years ago. Husband of co-worker lost special anniversary watch while cleaning sailboat, in slip. Water depth was 60 feet under his boat, and he "knew" exactly where it fell. I did four tethered dives in pitch black (took me two of those just to find the bottom), and came up with nothing. I don't think some people understand the lack of visibility (especially in fresh water lakes) or the trajectory a falling, flat object can take.
I hope he appreciated what he was asking you to do, and what you did for him, regardless of the outcome.