Evaluation Of Visual Outcomes In Patients With Aberrated Corneas Implanted With The Ic-8 Small-Aperture Iol

To assess the visual outcomes in cataract patients implanted with a small aperture intraocular lens (IOL) in eyes with aberrated corneas.

Singapore National Eye Centre, Singapore

Design: Prospective, non-interventional, single-centre clinical study

Methods Twenty-one subjects with aberrated corneas had IC-8 IOL implantation. Aberrated cornea was defined as from natural causes: keratoconus (n=1, 5%), high coma (n=1, 5%), or iatrogenic causes: laser vision correction (n=18, 86%), others (n=2, 10%). In 12 subjects, aberrated corneas were bilateral. Uncorrected(UC) and distance corrected(DC) visual acuities(VA) were measured at distance (600cm)(D), intermediate (66.7cm)(I), and near (40cm)(N). Defocus curve was tested monocularly and binocularly. Contrast sensitivity (CS) was measured under photopic and mesopic conditions with and without glare.

In IC-8 eyes, the mean logMAR±SD UCDVA, UCIVA, and UCNVA was 0.24±0.18, 0.19±0.18 and 0.14±0.14 respectively. Mean logMAR±SD DCDVA, DCIVA, and DCNVA in IC-8 eyes was 0.12±0.17, 0.16±0.15, and 0.19±0.13, respectively. Binocular mean logMAR±SD UCDVA, UCIVA, and UCNVA were 0.07±0.10, 0.07±0.10 and 0.13±0.12 respectively. Defocus curve testing yielded a depth of focus of 1.5D monocularly and 2.0D binocularly at a 0.2 logMAR threshold. Photopic binocular CS with and without glare improved over monocular CS of IC-8 and fellow eyes under all spatial frequencies. Mesopic binocular CS with and without glare were similar amongst monocular IC-8 and fellow eyes under all spatial frequencies. Majority of subjects reported low levels of visual symptoms. 

The IC-8 IOL provides good monocular and binocular visual outcomes for cataract patients with aberrated corneas.