Keratoconus is a rare evolving corneal ectasia that alters visual acuity. To improve spectacle-corrected visual acuity, various subjective refraction techniques can be used. The subjective refraction techniques of keratoconus-carrying patients have never been studied. The main hypothesis is that the most suitable subjective ocular refraction method varies with the corneal topography of the keratoconus. The main objective is to define the most appropriate refractive technique(s) based on corneal topographies in order to provide keratoconus-affected patients with the best spectacle-corrected visual acuity.
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Measure of keratometry (Km)
Timeframe: day 1
Measure of the maximum keratometry
Timeframe: day 1
Measure d_Kmax
Timeframe: day 1
Measure of index of surface varaiance
Timeframe: day 1
Measure of the Belin/AmbrĂłsio Enhanced Ectasia Display (BAD-D)
Timeframe: day 1