Crossed Cylinder Calculator
Determine resultant lens over existing lens combined with over refraction. Makes contact lens fitting more accurate. Useful in refining high powered e...
Alta Vista LLC
Vertex Conversion Eyeglass Prescription
Vertex distance adjustment calculator to convert sphero-cylindrical eyeglass prescriptions to the corneal plane. Spherical Equivalent of eyeglass pres...
Transpose Eyeglass Prescription
Handy and convenient app that transposes any eyeglass prescription from minus cylinder form to plus cylinder form, or from plus cylinder to minus cyli...
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