Vista Vision Tester

 

Specification:

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

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 80m

Corneal distance device: 2mm forward and 5mm backward from standard plane;with scale

Effective filed of view:19mm

 

Right eye

Left eye

O(Open aperture)

OC (Occluder)

± .50(Fixed cross cylinder)

6ΔU(6 prism dioter base Up)

10ΔU(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)

 

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