Gaush Raymond CT-6 Corneal Topographer uses a special photography technique that maps the surface of the clear, front window of the eye (the cornea). It is clinically used to diagnose corneal astigmatism, quantitatively analyze corneal shape, and display corneal diopter with data or different colors. It can also display in the mode of axial curvature diagram, refractive diagram, instantaneous curvature diagram and height diagram. This instrument helps to guide the data for corneal contact lens and improve the accuracy of contact lens adaptation.