Model Number: TR-VT-1000 Brand Name: Terui Key Specifications/Special Features: FeaturesElegant design for the appearance and easy and flexible optical lens dials.Precise optical lens with top-grade coatingCapable of checking up all-sided visual functions, accurate and comfortable in measurementWhen rotating risk is turning by sphereCan make sphere power adjust in 3.00d big scopeDesigned expediently and smartly for particular cross cylinderSupplementary fittings of complete set could measure nearsightedClear scale, convenient and durable operatingThis is 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 20D in 1D 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