Sensitivity to light is the inability to tolerate light, medically known as photophobia. Photophobia is a symptom of abnormal intolerance to visual perception of light. Eh, generally speaking, photophobia means that people is afraid of light and sensitivity to light. I made a deep search online and eventually got this information: firstly, photophobia typically causes a need to squint or close the eyes, and headache, nausea; secondly, eye dry, eye strain, chalazion, burn and glaucoma all these eye problems are related to photophobia. It really surprised me that so many eye problems can cause photophobia. But relax, photophobia is not a permanent vision problem if you receive a medical treatment and take a good rest, keep your doctors words in mind, then you'll recover soon.
Well, generally speaking, photophobia can not be permanent, only if you can try some ways to treat it. As we know that photophobia is eye discomfort in bright light and there are many reasons which can lead to it. In common, many different diseases, disorders, problems and conditions can be the causes. For example, an infection or inflammation that irritates the eyes can cause photophobia. So you need try your best to find out the causes, so that you can heal it. Of course, you need go and see the eye doctor, and he can tell you some advices.
Well, it seems that you have a lack of knowledge about photophobia, so as you can see it is such a terrible disease that nobody would like to make it a companion. So, it is resulted from some problems with your eyes including corneal or pupil or something, or your immune system. Anyway, it is not a deadly disease, but it would make you suffer a lot if not properly taken care of. Good luck.