The Vertex Conversion Chart app is suitable for optometrists, eye doctors, and individuals who wear contact lenses. Its purpose is to convert the lens power specified in a spectacle prescription to the corresponding lens power needed for contact lenses. The essential inputs for this conversion include the Vertex distance and Spectacle prescription power.
The Vertex distance is defined as the space between the back surface of corrective lenses, whether in glasses (spectacles) or contact lenses, and the front of the cornea.
Spectacle prescription power refers to the lens power necessary to correct the refractive error of the eye.
Indispensable for the optician, optometrist, ophthalmologist or a patient who wants to order new contact lenses! Best of all, it's completely free and easy to use.