Diagnostic Tests Fundus Photography A special examination technique in which photographs are made of the internal structures of the eye. Corneal Topography An examination technique that allows us to analyze the physical features and shape of the anterior surface of the cornea. External Ocular Photography A non-invasive procedure in which photographs are used to document conditions of the external structures of the eye. Refraction A test that determines the optical power of the eye and measures the combined function of the retina, optic nerve and visual pathways in the brain. Visual Field Examination A test that measures the combined function of the retina, optic nerve and visual pathways in the brain. Anterior Segment Imaging A non-invasive procedure that uses a low-powered laser to image the cornea, iris and anterior chamber of the eye. Extended Ophthalmoscopy An ophthalmoscopy technique that is used when a detailed examination of the retina is required.