general problems of the 1996 GEO Metro

The headlights on my wife's car, like so many others, have become almost opaque. After having the lights repaired at substantial cost I was told that it is due to uv exposure and that it does not affect all makes. Apparently some manufacturers produce lights that continue to function after exposure to sunlight. Some do not. I feel this is a real safety hazard. It significantly reduces the light output and it only takes a few minutes looking about any parking lot to realize that most go uncorrected. Why can't all manufacturers use headlights that do not turn yellow?.

Fuse box/headlight connection burnt/melted. Headlights non operative, only daytime running lights available. Replaced fusebox for second time. Replaced butt conector for fourth time.