Generally topographic maps are generated from aerial photographs that have a 60% overlap so they are 3d pairs. The people doing this work look at stereo pairs for 40 hours a week and do it over many years, even over a full career. I worked with a stereoscope looking at stereo pairs for several years.
The only problem I ever had was eye strain which had nothing to do with 3D
I never heard of it causing lazy eye, maybe lazy butt as I was working for the government at the time.