... : -5~+3D Slit Width: 0mm-9mm adjustable(slit is round when the slit width is 9mm) Slit Height: 1mm-8mm adjustable Slit Angle: 0°-180 ... Diameter(mm): Ø9,Ø8,Ø5,Ø3,Ø2,Ø1, Ø0.2 Slit Inclination: 5°,10°,15°,20°Filter:heat absorption,grey, redfree ... lens or four sides lens), funduscope, aspheric lens, teaching equipment slit lamp microscope