Well, yes, it can be a sign of photophobia. For photophobia, it is normal to feel sensitive to light. For the causes, many different diseases, disorders can be the causes. For example, the allergies or an infection which irritates the eyes, and then it can cause photophobia. According to some experts, people with depression, pain, high blood pressure, multiple sclerosis are likely to get it too. To treat it, you can just wear eye patch which can just protect your eyes from the irritants. Also, you can just eat certain foods such as Chinese wolfberries. Besides, carotene from carrots and vitamin A can be useful too.