VISTA Vision tester

Specifications 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 in use) +26.75D to -29.00D (when optional ±10.00D 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° in 5° steps Cross cylinder: ±0.25D,reversal type (synchronized with astigmatic axis) ±0.50D optional Rotary prism: 0 to 20D in 1D step Right eyeLeft eye O(Open aperture)OC (Occluder)± .50(Fixed cross cylinder) 6U(6 prism dioter base Up) 10U(10 prism dioter base Up) PH (Pinhole)+ .12(+0.12D sphere lens) RL(Red filter)RMH (Red maddox rod, horizontal)RMV (Red maddox rod, vertical) GL (Green filter)WMH (White maddox rod, horizontal)WMV (White maddox rod, vertical) P45°(Polarizing filter, axis 45°)P135°(Polarizing filter, axis 135°)R (Retinoscopic lens.+2.00D,for 50cm)Interpupillary adjustment: 48mm to 80mm in 1mm step(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 80mCorneal distance device: 2mm forward and 5mm backward from standard plane;with scaleEffective filed of view: 19mm