DESCRIZIONE
A glare visor (13) for reducing ambient light intensity presented to a wearer viewing a head up display employing display light including a given wavelength(s) of light is disclosed. The glare visor including a visor body comprising optically transparent material which is partially absorbing to light of visible optical wavelengths thereby to reduce the intensity of ambient light transmitted therethrough to the wearer. The glare visor also comprising a transparent first optical coating (12) formed upon a surface of the visor body intended to face away from the wearer in use which is partially transmissive to said light of visible optical wavelengths amongst which it is preferentially transmissive to light of a first sub-range of wavelengths for including therein given wavelength(s) of display light thereby to permit an enhancement of contrast between display light relative to ambient light; and a second optical coating (10) formed upon a surface of the visor body, intended to face towards the wearer in use, which is substantially transmissive of said light of visible optical wavelengths amongst which it is preferentially reflective of a second sub-range of wavelengths of light thereby to provide a projection display surface in respect of the second sub-range of light. The the first sub-range of wavelengths includes or overlaps the second sub-range. [Image Omitted]