Most cars' headlights are designed with a reflector that refracts light from a light bulb towards the road. Manufacturers started using projector (polyellipsoidal) lamps again in the early 80's. In this system a filament is located at one focus of an ellipsoidal reflector and has a condenser lens, a hemispherical glass, at the front of the lamp. A shade located at the image plane, between the reflector and the lens, and the projection of the top edge of this shade provides the low-beam cutoff. The shape of the shade edge, and its exact position in the optical system, determines the shape and sharpness of the cutoff. Newer model vehicles have a far better glass composition and condenser lens shape that contributes to its light focus or projection.