NOTE : Colored rings are special order. Please allow an additional seven (7) days to process & ship. The Double Aspheric 78D is an excellent general diagnostic and laser treatment lens offering an ideal .93x image magnification and wide 97 dynamic field of view. It is optimally designed for use within the range of motion of all slit lamps. Specifications   Field of View 81°/ 97° Image Mag. .93x Laser Spot Mag. 1.08x Working Distance 8mm Primary Application General diagnosis and treatment. Lens Demonstration - Move your mouse over image to control - Requires free FLASH Plug-in (Click here to download if image does not appear)