Is it inappropriate for a yeshiva bochur to walk into the Beis Medrash with glasses that have a darked colored frame like darkish green? What about a brighter color?
For some reason, everything that is NOT BLACK is forbidden in the yeshivish world. If you want to ever get a shidduch, give a red light to the green frames and go black. This will remain a blot on your shidduchim resume forever and prospects will dry up for your future children, too.