Once youre done dye subbing the front of the eye mesh, you can immediately dye sub the back of the eyemesh black. Just print a black square onto the sublimation pater, and dye sub it directly to the back of your eyes. Improves visibility immensely.
You can also do this if you plan to paint the front! The perk of using this over paint is that it will never rub off. Its a HUGE different visibility wise.