ERF-2600 Phoroptor: (White) Features: Elegant desing of butterfly shape apperance. Capable of checking all-sided visual function, comfortable and precise measurments. High graded plated-film used in all optic lenses. The device is applicable to ophthalmology departments in hospitals and spectacle stores for precision measurment of visual functions such as myopa, hyperopia, astigmatism, eyesight balance, heterophoria, stereoscopic vision and eyesight amalgamation. New Leveling Mechanism: Reduce time leveing and adjusting the phoroptor. Fingetip adjustment for Sphere Power Control: With an innovative fast feed dial, rotating the knobs is effortless yet precise. Fast Astigmatic testing: Interlocking mechanism of the cross cylinder lens axis, will allow you to get a one touch accurate reading results. Sanitary Face Shield: New material technology coupled with ease of remove, to provide your patients a clean enviroment. Precision Machined to finest Tolerances: ERF-2600 employs top quality bearings, eliminating the need for periodic lubrication. Specifications: Sphere Power Range: +16.75D to -19.00D, minimum readings 0.25D or 0.12D (when +0.12D auxillary lens or optional +/- 0.12D lens is in use). +26.75D to -29.00D (when optional +/-10.00 lens is in use). Cylinder Power Range: 0 to -6.00D with minimum readings 0.25D or 0.12D (when auxillary lens is in use) 0 to -8.00D (when -2.00D auxillary lens is in use). Astigmatic Axis Scale: 0-180 in 5 degree steps Cross Cylinders: +/- 0.25D, reversal type (synchronized with astigmatic axis). Rotary Prism: 0 to 20D in 1 degree steps Interpupilary 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) inpupillary distance enabling convergence = 57mm to 80mm. Corneal distance device: 2mm forward and 5 mm backward from standard plane: with scale. Effective field of view: 19mm minus cylinder.