Optometry Equipment Manual Phoropter for Selling Ophthalmic Manual Eye Tester VT-10C Foropter Optical Instruments 1. Elegant design of butterfly-shape appearance 2. Capable of checking up all-sided visual functions, precise and comfortable in measurement 3. Exquisite manufacturing technique, with comfortable feel 4.This device is applicable to ophthalmology department of hospitals and spectacle stores for precision measurement of visual functions such as myopia, hyperopia, astigmatism, eyesight balance, heterophoria, stereoscopic vision and eyesight amalgamation 5.Three color options:White or Black or gray Sphere powers range 16.75D to－19.00D, Steps:0.25D Cylinder power range 0~-6.00D, Steps:0.25D Astigmatic axis scale 0 to 180° ,each step is 5° Cross Cylinder 0.25D ±0.50 Select Rotary Prism 0 to 20 Each step is 1∆D Interpupillary adjustment 50mm to 80mm Steps:1mm Forehead rest adjustment 16mm backward and forward Convergence 57mm to 80mm Steps:2mm Corneal distance device 2mm forward and 5mm backward Effective field of view 19mm Weight 4.6kgs Size 340mm×310mm×110mm