Fig. 3. The Koeppe diagnostic gonioscopy lens permits the simultaneous examination of the anterior chamber angle in both eyes, facilitating the comparison of the angles in patients with asymmetric or unilateral disease. Direct ophthalmoscopy is facilitated by the lens, which does not have a central dimple to obscure the view. It is often possible to obtain an excellent view of the optic nerve through a small pupil. In this 6-month-old with Sturge-Weber syndrome, a unilateral angle appearance similar to trabeculodysgenesis was noted in the right eye, which was also buphthalmic with an intraocular pressure of 36 mmHg.