Evaluation Of Visual Outcomes In Patients With Complex Corneas Implanted With The Ic-8 Iol

To assess the visual outcomes in cataract patients treated with contralateral implantation of a small aperture intraocular lens (IOL) in eyes with a history of corneal irregularity.

Teritary Level Centre 

Prospective, non-interventional, single-visit, clinical study of 21 subjects with complex corneas previously implanted with the IC-8 IOL in one eye. For this study, complex cornea is defined as from pre-existing natural causes: keratoconus (n=1) or high coma (n=1), or induced causeslaser vision correction (n=17), other (n=2). In 12 subjects, complex corneas were bilateral. Uncorrected (U) and distance corrected (DC) visual acuities (VA) were measured at distance (6m)(D), intermediate (66.7 cm)(I), and near(40cm)(N).  Defocus curve testing was performed monocularly and binocularly. Monocular and binocular contrast sensitivity (CS) was measured under photopic and mesopic conditions with and without glare and visual symptoms were assessed.

The results showed mean logMAR ± SD UCDVA, UCIVA, and UCNVA in the IC-8 eye of 0.24 ± 0.18 (20/35), 0.19 ± 0.18 (20/31), and 0.14 ± 0.14 (20/28) and mean logMAR ± SD DCDVA, DCIVA, and DCNVA in the IC-8 eye of 0.12 ± 0.17 (20/26), 0.16 ± 0.15 (20/29), and 0.19 ± 0.13 (20/31), respectively. Defocus curve testing yielded a depth of focus of 1.5 D monocularly and 2.0 D binocularly at a 0.2 logMAR threshold. Photopic binocular CS with and without glare was improved over monocular CS of IC-8 and fellow eyes under all spatial frequencies. Mesopic binocular CS with and without glare remained largely unchanged over monocular IC-8 and fellow eyes under all spatial frequencies.  The majority of subjects reported low levels of visual symptoms. 

These results demonstrate that the small aperture IC-8 IOL provides good distance, intermediate and near visual acuity for cataract patients with complex corneas.