The EM shielding is simply a wire mesh, not tint. The glass doesn't have to be darkened, and probably wasn't, but often the room is darkened to make the scan more comfortable and calming. Also, in my experience the room doesn't have many lights, and the patient is inside the bore, making them hard to see.
MRI and other radiology suites use lead glass windows, which are incredibly thick and tinted dark-yellowish-orange. Visibility through them is okay, but not great.
MRI windows aren't leaded, that would do nothing for RF or magnetic interference. MRI windows contain copper mesh and are designed to integrate with the rest of the Faraday cage to both keep the RF generated by the machine in the room, and keep external radiation away from the sensors. Also keep the acoustic noise in the room.
This also doesn't do anything against the (static) magnetic field, which is really hard to block except with material like steel, which don't make very good windows. Newer machines have a counter-magnet to redirect the field to extend less far from the machine.
