What is an OCT test?

OCT stands for Ocular Coherence Tomography. This is mainly used for examining the thickness of retina. In some diseases, retina in the back of the eye becomes thicker or thinner. You are suspected of retinal hole, which affects vision not pupil as you mentioned. The other test will be fluresceine angiography, which takes a series of photographs of the back of the eye with special fundus camera to tell more about the pathology.