EXPERIENCE of discomfort or pain to the eyes due to light exposure.People with photophobia may feel eye pain from even moderate LEVELS of artificial light and avert their eyes from artificial light sources.Ambient levels of artificial light may also be intolerable to persons afflicted with photophobia and they might dim or remove the light source, or GO into a dimmer lit room.Possible causes of Photophobia:-Too much light entering the eye due to damage in the eye.Too much light entering the eye due to the lack of pigment in the colored part of the eyes.Over-stimulation of the PHOTORECEPTORS in the retina.Excessive electric IMPULSES to the optic nerve.