UltraVision has created this useful tool to help you find the optimal fitting contact
lens using K Readings and spectacle prescription. The calculator below was designed
specifically for UltraVision specialist lenses.
Simply input the flat and steep K readings, the spectacle Rx, HVID and BVD into
he calculator below and click "Calculate". The contact lens prescription will then
To calculate a contact lens prescription for Avanti Lens please click HERE. For help fitting
KeraSoft, please click HERE
Finding it difficult to measure HVID and BVD?
Send us an e-mail for a free Avanti ruler at firstname.lastname@example.org
Spec RX Input
Contact Lens Prescription