my eyesight is pretty good, not perfect by any means, but it works (prizm correction, mostly use glasses to read).

the 4x is old, as in my grandfather was using it since before my dad can remember... and my dad is 50.

I would imagine that its at least an early '60s or older piece. its cross-hair only and seems to hold POI quite well, but its not the clearest I've ever seen...