The effect of rigid gas permeable contact lenses on visual quality and corneal aberrations in the keratoconus patients

• Published in: Boğaziçi tıp dergisi 2021-01, Vol.8 (1), p.21
• Main Authors: Atakan, Tuğba Gençağa, Kurna, Sevda Aydın, Yelda Buyru Bozkurt, Şahin, Tayfun, Atakan, Mehmet
• Format: Article
• Language: eng ; tur
• ISSN: 2149-0287; 2149-0287
• DOI: 10.14744/bmj.2020.58661

INTRODUCTION: Aim was to investigate the effects of rigid gas permeable contact lenses (RGPCL) on visual quality and corneal aberrations in the patients with keratoconus and myopia. METHODS: Thirty-one eyes of 17 patients wearing RGPCL because of myopia (Group A) and 72 eyes of 47 patients who had keratoconus (Group B) were included in this study. Keratoconus patients were divided into four subgroups according to the Amsler-Krumeich classification. All patients underwent examination procedures, including visual acuity, contrast sensitivity and simulated keratometric value (sim K), surface asymmetric index (SAI), surface regularity index (SRI), predicted visual acuity (PVA) values measured with corneal topography; mean RMS values of spherical aberration, coma, trefoil, and total high order aberrations (THOA) measured with aberrometry, before and after RGPCL application. RESULTS: Mean best-corrected visual acuity values before lens use was 0.68 (±0.33) and afterwards 0.86 (±0.20) in Group A, 0.37 (±0.21) and 0.83 (±0.17) in Group B, respectively. During low contrast sensitivity measurement, nine letters were gained after wearing contact lenses in Group A, 18.7 letters in Group B. The change of topographic values after contact lens use was significant in both groups. The amount of change was more significant in Group B when compared to Group A (p