Two problems related to headlights have been reported for the 2016 Toyota Prius. The most recently reported issues are listed below.
Condensation building up in passenger side headlight. The car has only 31,200 miles. Not cracks visible from outside on headlight assembly. Condensation distorts the light beam and dimming the light intensity.
When driving with a heavy load in the back or with large adults in the back seat it causes the headlights to point upward blinding on coming cars. Yes you can manually lower the lights via the screw under the hood but that's an inconvenience as I will not be able to see further down the road. Sometimes the headlight blinds oncoming cars even without a heavy load causing oncoming cars to flash me and I have to flash them back to prove to them I have my lows on. At times when I get too many flashes I end up driving with just the dim day running lights to make sure I don't blind oncoming cars causing me to compromise my night driving safety. Toyota should provide auto leveling headlights lights or a firmer suspension to ensure the level of the head light is pointing where it should be.