The 90D features a small 26mm diameter ring design which is outstanding for dynamic fundoscopy. Volk's exclusive Double Aspheric optical design expands the usable viewing field beyond that of competitive designs. The Volk 90D has good small pupil capabilities, making it ideal for a quick look at the posterior pole. Supplied in a high quality storage case. Magnification 0.76x FOV 74/89° 7mm working distance.