VKone | Keratoconus


  • State of the art, bi-aspheric, next generation keratoconic lens.
  • Manufactured in Contamac Optimum materials.
  • Even larger optical zones, seamless eccentricity provides great centration and vision.


  • Patients who have been diagnosed with Keratoconus or pellucid marginal degeneration.

Lens Parameters

  • This is a custom made product that is available in virtually any curve, any sagital depth.
  • Available in a standard 14 lens fitting set, with Base Curves ranges 70d-44d, in three main diameters: 9.0, 9.8, 10.6.
VKone Fitting Guide
Lens Type | Keratoconus
Diagnostic Lens Color | Blue
  1. Determine the base curve by referring to the steepest K reading or steepest sim K value.
  2. If reliable K readings or corneal topography data is not available, select the 50.00D (6.75mm) base curve lens from the diagnostic set.
  3. A lens should exhibit a slight clearance over the central corneal ectasia.
  4. Analyze the peripheral curve for an alignment pattern with an adequate edge lift, if adjustments are needed, use the step system to modify the edge lift of the lens.
  5. Call your Valley Contax lens consultant to customize the fit for your patient.