Features

*Designed expediently and smartly for particular cross cylinder

*Clear scale, convenient and durable operating

*Elegant design for the appearance and easy and flexible optical lens dials.
*Precise optical lens with top-grade coating

*Capable of checking up all-sided visual functions, accurate and comfortable in measurement
*When rotating risk is turning by sphere
*Can make sphere power adjust in 3.00d big scope
*Supplementary fittings of complete set could measure nearsight
*Suitable for eyesight examination in spectacles shops, department of ophthalmology in hospitals, schools and enterprises
*Two colors choice

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 is 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)
Rotary prism: 0 to 20∆D in 1∆D step
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 80mm
Corneal distance device: 2mm forward and 5mm backward from standard plane; with scale
Effective field of view: 19mm