Volk Digital Wide-Field Non Contact Slit Lamp Lens - Blue Advanced double aspheric design provides enhanced imaging; Unique glass surface curves and coating minimize distortion and reflections Ultimate 90D lens with similar magnification and widest field of view past the vortex High index glass ensures highest resolution stereo image, even through small pupils Field of View: 103/124; Image Magnification: .72x; Laser Spot: 1.39x; Working Distance 4-5mm Lens comes with Volk's new single lens case. Custom engraving of lens and case available, if purchased from Volk.com.