Phoropter Ophthalmic Equipment Phoropter VT-5C Foropter Instrument Sphere powers range: 16.75D to－19.00D, with minimum reading 0.25D or 0.12D (When 0.12D auxiliary lens or optional±0.12D lens is in use) Cylinder power range: 0 to－6.00D, with minimum reading 0.25D or 0.12D (when auxiliary lens is in use) 0 to－8.00D (when－2.00D auxiliary lens is in use) Astigmatic axis scale: 0 to 180°, each step is 5° Cross cylinder: ± 0.25D, reversal type (synchronized with astigmatic axis), also can select ±0.50D Rotary prism: 0 to 20∆D, each step is 1∆D Interpupillary adjustment: 50mm to 80mm, each step is 1mm (right and left synchronized) Forehead rest adjustment: 16mm backward and forward Convergence: The optical axes of the lenses are aligned at a distance of 400mm from the vertexes of the corneas (2mm each for right and left inward) Interpupillary distance enabling convergence=57mm to 80mm Corneal distance device: 2mm forward and 5mm backward from standard plane with scale Effective field of view: 19mm Weight: 5kgs Size: 323mm×315mm×85mm Astigmatic axis scale 0 to 180° in 5°steps Rotary prism 0 to 20 delta D in1 delta D step PD adjustment 50mm to 80mm in 1mm step Forehead rest adjustment 16mm backward and forward Effective field of view 10.19mm