###Human: What is causing blurred vision only in sunlight? ###Assistant: Hello. The symptom that you are suffering from is referred to as hemeralopia, this symptom can be caused due to a number of different conditions. The most common mechanism of such a blurring involves a central corneal opacity or cataract obstructing central light rays when the pupils are constricted in bright light. I can tell you that most of such causes are treatable and can be picked up quite easily on a simple eye exam. So, I suggest that you visit an ophthalmologist. In case you need any further information, please send me a scanned copy of your doctors reports. I will do my best to help.