All of the following causes coloured halos except: (A) Corneal edema, (B) Retinal degeneration, (C) Foreign body, (D) Steroids
Answer is B. 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