A comparison of the visual acuity outcome between Clearkone and RGP lenses

Mohammadali Hassani; Ebrahim Jafarzadehpur; Ali Mirzajani; AbbasAli Yekta; Mehdi Khabazkhoob

doi:10.1016/j.joco.2017.08.006

A comparison of the visual acuity outcome between Clearkone and RGP lenses

J Curr Ophthalmol. 2017 Aug 26;30(1):85-86. doi: 10.1016/j.joco.2017.08.006. eCollection 2018 Mar.

Authors

Mohammadali Hassani¹, Ebrahim Jafarzadehpur², Ali Mirzajani², AbbasAli Yekta³, Mehdi Khabazkhoob⁴

Affiliations

¹ Noor Research Center for Ophthalmic Epidemiology, Noor Eye Hospital, Tehran, Iran.
² Department of Optometry, Iran University of Medical Sciences, Tehran, Iran.
³ Refractive Errors Research Center, School of Paramedical Sciences, Mashhad University of Medical Sciences, Mashhad, Iran.
⁴ Department of Medical Surgical Nursing, School of Nursing and Midwifery, Shahid Beheshti University of Medical Sciences, Tehran, Iran.

Abstract

Purpose: To compare the visual acuity outcome of the ClearKone SynergEyes™ hybrid contact lens and Boston XO rigid gas permeable (RGP) contact lens in patients with keratoconus.

Methods: Twenty-eight eyes with keratoconus participated in this study. The visual acuity was examined once with the RGP lens and once with the ClearKone SynergEyes™ hybrid contact lens.

Results: The mean corneal keratometry, the mean lens back optic zone radius, and the mean vault was 7.23 ± 0.62 mm, 7.67 ± 0.44 mm, and 277.94 ± 104.5 μm, respectively. Visual acuity was significantly better with the ClearKone SynergEyes™ hybrid lens (P = 0.004). The mean best corrected visual acuity (logMAR) was 0.022 ± 0.03 and 0.057 ± 0.09 for the ClearKone and RGP lens, respectively. The Clearkone lens yields an average improvement of one line of the Snellen chart in comparison with the RGP lens.

Conclusion: The ClearKone hybrid contact lens and the RGP lens may improve visual acuity in corneal irregularities. But patients who are able to afford hybrid lens wearing may show better visual acuity.

Keywords: ClearKone hybrid contact lens; Irregular cornea; Keratoconus; Rigid gas permeable.