A method (100) for reducing headlight glare experienced by a user of a vehicle (10), the vehicle (10) comprising a headlight system (12) having at least one headlight (30, 32) operable to illuminate an environment external to the vehicle, the method (100) comprising: illuminating the environment external to the vehicle; obtaining (102) image data of the illuminated environment; performing (146) a first analysis of brightness values of the image data to identify reflective surfaces that may cause glare; performing (148) a second analysis of brightness values of the image data to categorise the identified reflective surfaces into at least two categories; and adjusting (149) the light output from the at least one headlight (30, 32) in the direction of each identified reflective surface in dependence on the category of that reflective surface.