I have an enlarged right pupil in lower lighting conditions. Mostly, the right pupil is slightly enlarged (bigger than the left one) but once or twice the left one was slightly bigger. In brighter conditions such as outdoors, the pupils appear equal. I noticed this about four or five months ago. I have no other symptoms that I could relate to this. I am a diabetic (type II) and take medicine orally for diabetes and for anxiety and depression. Am 45 year old female.