I know this is probably a silly question, but I've been struggling with it for a while now and hope someone may have a suggestion/solution for it:

When on the zafu, with my eyes semi-closed and my gaze fixed on the floor, I find that my eyes tend to unfocus. Now for most folks, that may not be a problem but I ruined my eyes my 14th summer staring off into space like that and ended up needing glasses by the time I was back in school in September. I now have progressive bifocals and I find, after zazen, that I am unable to see clearly for quite a while afterwards.

Do I need to focus completely on the wall/floor despite the distraction, or should I maybe remove my glasses entirely? Honestly, I can't afford for my eyes to get any worse, considering how much glasses cost nowadaysóbesides the fact that I'm darn near blind afterwards.

Any help would be greatly appreciated!