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Benefits of Empirical Fitting

Visual Clarity of a GP Lens

Hybrid lenses offer crisp GP optics, stable vision not affected by lens rotation1, and SoftCushion® Comfort, delivering great vision for patients.  Empirical fitting of hybrid lenses is now available for patients with astigmatism, presbyopia, keratoconus or other irregular cornea conditions.  UltraHealth, SynergEyes KC, SynergEyes A, Duette and Duette Progressive hybrid lenses can all be fit empirically.  

With empirical fitting, patients have a wearable first lens experience that showcases the exceptional visual qualities of the hybrid lens from the start.  



Empirical fitting of hybrid lenses can bring increased efficiency to your practice by saving valuable chair time, streamlining the fitting process, reducing reliance on reusable fit sets (with the associated maintenance that they require), and eliminating physical application of trial lenses on patients.  Empirical fitting removes the need to disinfect and reuse a diagnostic lens and replaces it with a technology-driven, custom design.  SynergEyes has developed a proprietary algorithm that determines the custom lens to manufacture for each patient, using accurate patient measurements.


Revenue Retention

SynergEyes hybrid lenses are available exclusively through Independent ECPs (not online or through mass merchandisers), providing an opportunity for practice differentiation and recaptured revenue. Practitioners retain 100% of their revenue and profitability from their hybrid patient care.


1. GP optics negate corneal astigmatism; rotation of lens inconsequential.

Download Empirical Design Instructions Now_a

How to Empirically Prescribe UltraHealth

Hybrid Contact Lenses

Hybrid contact lens options that can be prescribed empirically for patients with keratoconus include SynergEyes KC and UltraHealth. 

UltraHealth lenses are the most advanced hybrid lens.  While indicated for keratoconus, the 'Continuum of Care' sweetspot is for patients with mild to moderate keratoconus.  UltraHealth is designed to vault the corneal ectasia, providing well-centered, gas permeable vision along with comfort from the soft skirt.

To Place an Empirical Order:

Provide a topography (PDF or raw data) with the following information to a SynergEyes Technical Consultant:

  1. Keratometry readings
  2. Eccentricity data, often listed as e, e2, CEI,
    Shape Factor, or Q value
  3. HVID
  4. For power, provide previous RGP or scleral data with
    base curve and over-refraction.

Using the data listed above, a recommended lens will be ordered. 

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Read More About UltraHealth Empirical Fitting

How to Empirically Prescribe Duette

Duette and Duette Progressive

Duette hybrid lenses are ideal for patients with astigmatism or presbyopia. The hybrid design eliminates rotation issues experienced with soft toric lenses, while providing stable centration for excellent visual acuity. Duette Progressive Center Distance and Center Near designs enable optimal presbyopic vision correction customization.

Fitting Duette is straightforward. Lenses may be fit empirically without the need for diagnostic sets or fluorescein. Provide Ks, Rx and HVID, with add power and pupil size, to create the initial lens. The Duette Empirical Calculator can be used to help select the initial lens. 

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Webinar and Other Resources


Specialty Fitting in a New Age

by Louise A. Sclafani, OD, FAAO, FSLS

New disinfecting protocol by the ISO was introduced at the American Academy of Optometry in 2019, and at the GSLS in 2020 at the height of the COVID pandemic. These new standards highlighted how crucial it is to have alternative ways to accurately fit patients for specialty lenses without the need to physically fit the lens on a patient.  Empirical fitting capabilities not only adhere to these standards with ease, but provide a customized fit which results in a better wearing experience for the patient.


Duette Hybrid Lens

“The Duette lens really helps me take care of my astigmatic patients…the RGP center can rotate 360 degrees and it still can be used to deliver the fantastic optics that we would want out of an astigmatic lens…and for me, that is very comforting as a practitioner.”

Dr. Pfeil

Todd Pfeil, OD

UltraHealth Hybrid Lens

“The UltraHealth lens is a great option for those mild to moderate cones who want great vision, good comfort and who need that excellent centration. It’s a fantastic lens option for those patients.”


Jennifer Harthan OD, FAAO, FSLS