Auto Phoropter,view tester Beautiful appearance, high quality lenses,wear well,Easy and convenient operating.Of high quality. Auto Phoropter,view testerSpecifications Sphere: 0.0 to -29.50 Diopters, step: 0.12,0.25,0.50,1,3 0.00 to +26.75 Diopters, step: 0.2,0.25,0.5,1,3 Cylinder: 0.0 to ± 8.75 Diopters, step:0.25,0.5,1,3Cylinder Axis: 0°to 180° step:1°,5°,15° Prism: -20 to +20, step:0.1,0.5, ...