Seeing a doctor. A person who has the aforementioned symptoms should go to their eye doctor for an eye exam. The doctor will measure the thickness of their cornea through a technique called pachymetry and use a special microscope called a slit lamp to search for blisters on the cornea. The ophthalmologist will take a photo of the cornea to be able to count how many cells are in the cornea’s endothelium. A person with Fuchs’ dystrophy has an abnormally low number of endothelial cells. The slit lamp can also pick up minuscule injuries in the endothelium known as corneal guttata. The doctor will also test the patient’s visual acuity by using an eye chart.