Alta Vista LLC

Determine resultant lens over existing lens combined with over refraction. Makes contact lens fitting more accurate. Useful in refining high powered e …

Vertex distance adjustment calculator to convert sphero-cylindrical eyeglass prescriptions to the corneal plane. Spherical Equivalent of eyeglass pres …

Handy and convenient app that transposes any eyeglass prescription from minus cylinder form to plus cylinder form, or from plus cylinder to minus cyli …