Daylight Adaptation( Races of Eberron, p. 108)
You have grown accustomed to living in the surface world, such that bright light no longer blinds or dazzles you.
Light blindness or light sensitivity,
Unlike other members of your kind, you are not blinded or dazzled by exposure to bright light or sunlight. However, light spells or effects that affect all creatures, such as a sunbeam or sunburst, still affect you normally.