Keratoconus and Visual Performance with Different Contact Lenses

Abstract

Ana Marta,1,2 João Heitor Marques,1 Daniel Almeida,1 Diana José,1 Irene Barbosa1,2 1Department of Ophthalmology, Centro Hospitalar Universitário do Porto (CHUPorto), Oporto, Portugal; 2Instituto de Ciências Biomédicas Abel Salazar (ICBAS), Oporto, PortugalCorrespondence: Ana MartaDepartment of Ophthalmology, Centro Hospitalar e Universitário do Porto, Largo do Prof. Abel Salazar, Porto, 4099-001, PortugalEmail [email protected]: To analyze the visual performance in contact lens wearers with keratoconus.Methods: A retrospective study including contact lens (CL) wearers was performed. The current best-corrected visual acuity with contact lens (BCVA-CL) and with spectacles (BCVA-S) correction, contrast sensitivity (CS) (by Metrovision-MonPack3®), analysis of light scattering in the retina and vision break-up time (HD Analyzer®), and corneal tomography (Oculus Pentacam® HR) were evaluated.Results: This study included 96 eyes of 59 patients with Keratoconus. Rigid gas permeable contact lenses (RGPCL), hybrid contact lenses (HCL), and silicone hydrogel/hydrogel contact lenses (HGCL) were fitted in 67, 17, and 12 eyes, respectively. Dynamic objective scatter index (OSI) (p = 0.024), minimum OSI (p = 0.037) and maximum OSI (p = 0.040) were significantly better with RGPCL and worse with HGCL. Mean CS in photopic conditions was significantly worse with HGCL and better with HCL (p = 0.006), without differences in mesopic conditions (p = 0.121). RGPCL wearers showed a higher mean K (p = 0.020), and a lower corneal thickness at the thinnest point (p=0.011).Conclusion: Visual quality varied significantly with different types of CL. Although RGPCL was fitted in patients with worse Pentacam tomographic parameters, RGPCL was associated with a better dynamic visual quality.Keywords: keratoconus, contact lens, visual performance, optical quality

Keywords

• keratoconus
• contact lens
• visual performance
• optical quality