Efficacy of software-based fitting in OrthoK

Efficacy of software-based fitting in orthokeratology

Elien Janssen BOptom
Walter Wolterinck MSc.

Purpose: Some markets fit ortho-keratology (OK) using trial contact lenses (CLs). This can make the procedure complicated; more experience is needed, it can be time consuming and there is a risk of cross infection with trial lenses. In western markets, most OK CLs are fitted empirically with digital software, calculating the unique CLs based on topography and subjective refraction. This study was to analyse the overall success of digital OK fitting and the quantity of lens exchanges needed to reach success.

Method: The database of the MyProcornea lens fitting platform was analysed for fits between January 2015 and July 2017 (www.myprocornea.com). Data from eyes fitted with DreamLite OK (DOK) CLs using the fitting software were analysed at least 2 years after the initial fit. DreamLite standard and DreamLite TRX (toric) were included; the CL is licensed for fitting up to -5.00DS. DOK is a yearly replacement system; two reorders with a yearly interval was considered a successful fit.  The amount of lens exchanges per eye, when needed, within 3 months of the initial fit to reach a satisfactory outcome, were also analysed.

Results: With 1000 eyes fitted with MyProcornea software, there was an overall success rate of 70% i.e. still wearing DOK after 2 years. The success rate was highest for the Rx group -1.50DS to -2.50DS (77%); lowest was for Rx group -3.50 to -5.00 (66%). With higher powers, first fit success rate decreased; -3.50 to -5.00DS needed one lens exchange (2 lenses total) in the first 3 months, whereas 25 % of eyes between -0.50 to -2.50DS required a lens exchange lens for satisfactory outcome.

Conclusions: This study confirmed that digital, empirical fitting of OK is successful and effective with DreamLite and the MyProcornea software for the range -0.50 to -5.00DS.

1st Author Biography: Ron Beerten  BOptom, FAAO, FBCLA, FIACLE  Ron Beerten graduated from the Christiaan Huygens Opticien School in the Netherlands in 1983.  In 1996 Ron graduated from the Hoge School van Utrecht, (Optometry School) in the Netherlands. In the same year he became Fellow of the American Academy of Optometry. In 2006 he became Fellow of the British Contact Lens Association and in 2014 Fellow of IACLE.  Ron joined Procornea Contact Lens Laboratory in Eerbeek in 1996 Here Ron plays a key role in product development.  In August 2017 Ron was appointed as Technical Director at Procornea Nederland bv.

*Data correct at the time of submission to BCLA by NCC.