OPHTHALMIC
The Refractor RT-600 from NIdek Co Ltd is smooth and gives accurate Measurement of Spherical and Cylindrical features.It has SPH range from +16.75 to -19.00D,CYL range from 0 to -6.00D and increments of 0.25D. Adding to these,the instrument has cross Cylinder Configuration,auxiliary Lenses and Convergence System.