<prompt> All of the following causes coloured halos exceptCorneal edemaRetinal degenerationForeign bodySteroids  <response>: Halos can sometimes be a normal response to bright lights. Halos can also be caused by wearing eyeglasses or corrective lenses contact lenses, or they can be a side effect of cataract or LASIK surgery. ... Thehalos are a result in diffraction of light entering your eye 