NOTE : Colored rings are special order. Please allow an additional seven (7) days to process & ship. The original Volk 90D lens started the slit lamp examination revolution! It features a small 26mm diameter ring design which is outstanding for dynamic fundoscopy. Volks 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. Specifications   Field of View 74°/ 89° Image Mag. .76x Laser Spot Mag. 1.32x Working Distance 7mm Primary Application General diagnosis / small pupil examinations Lens Demonstration - Move your mouse over image to control - Requires free FLASH Plug-in (Click here to download if image does not appear)