Dilated pupils are pupils that appear enlarged and larger than normal. The muscles in the iris control your pupils' size as does the amount of light entering the eye. Generally speaking, the pupils constrict in bright light conditions to allow less light into the eyes and dilate in dim lighti...
In bright light, they get smaller or constrict to let in less light. Sometimes, pupils can dilate without any change in light. The medical term for this is mydriasis. Medicines, injuries, and diseases can all cause this eye condition. Here's a closer look at some of the causes. Dilated...