The contact owns a 2014 Kia Optima. The contact stated while driving at night, the low-beam headlights were very dim. The contact stated that the high-beam headlights had to be used while driving in poorly lit areas. The contact had called a local dealer and was informed that a diagnostic test was needed to check the headlights. The contact had taken the vehicle to an independent mechanic and was informed that the reflective coating in the headlight assemblies had deteriorated to the point that there was an accumulation of reflective material debris on the headlamp floor and that other reflective material was peeling away from the sides of both headlight assemblies. The contact was advised by the mechanic that the heat of the light bulbs was degrading the reflective material. The headlight assemblies were not replaced. The contact changed the light bulbs and both headlights were still dim. The vehicle was not repaired. The manufacturer was informed of the failure. The failure mileage was approximately 135,000.