Method and device for presenting a visual comparison of two different curved surfaces

Claim 1

A DEVICE FOR VISUALLY ILLUSTRATING THE RADIUS OF CURVATURE OF THE EXTERIOR CORNEAL SURFACE OF AN EYEBALL COMPRISING: A SCREEN HAVING A TARGET IMPRINTED THEREON, THE TARGET HAVING THE FORM DERIVED FROM THE REFLECTION OF CONCENTRIC LIGHT RINGS FROM A SPHERICAL REFLECTIVE SURFACE OF KNOWN RADIUS; A LIGHT SOURCE POSITIONED TO CAST LIGHT ON SAID SCREEN; A PHOTOGRAPH HOLDER SUPPORTED IN A PLANE PARALLEL THE SAID SCREEN AND BETWEEN SAID SCREEN AND SAID LIGHT SOURCE; A PHOTOGRAPHIC NEGATIVE OF REFLECTED CONCENTRIC LIGHT RINGS FROM THE EXTERIOR CORNEAL SURFACE OF AN EYEBALL HELD BY SAID PHOTOGRAPH HOLDER WHEREBY THE RINGS OF SAID PHOTOGRAPHIC NEGATIVE ARE PROJECTED ONTO SAID TARGET IMPRINTED SCREEN;