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.