This is a free vertex distance calculator for use in Optometry that supports both sphere and cyl conversions. This was essentially a Christmas present for my wife, who's a student at UHCO (University of Houston College of Optometry). However anyone is free to use it. 100% free and NO ADS. Please rate the app if you like it!
This version of Contact Lens Vertexing Android App comes with one universal variant which will work on all the Android devices.
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