Visual Outcomes And Defocus Profile With An Enhanced Monofocal Intraocular Lens Utilizing Controlled Positive Spherical Aberration

To evaluate the visual outcomes following bilateral implantation of the RayOne EMV enhanced monofocal intraocular lens with targeted micro-monovision.

Southend Private Hospital, UK

50 subjects assessed at 12 to 18 months post-operatively. Unaided and best distance corrected acuity was assessed both monocularly and binocularly at distance (6m), intermediate (70cm) and near (40cm). Defocus curves were assessed from +1.50D to -5.00D in 0.5D steps with additional steps at +0.25D and -0.25D. This was assessed monocularly and binocularly. Contrast Sensitivity was assessed using a computerised Pelli-Robson chart.

Unaided distance visual acuity was significantly different in the dominant and non-dominant eye (p<0.01), dominant 0.08±0.10 and non-dominant 0.29±0.17LogMAR, with spherical equivalent of -0.05±0.34 and -0.91±0.60 respectively. Best corrected distance, intermediate and near visual acuities were similar. However, significant differences were found in unaided intermediate (p<0.01) and unaided near visual acuity(p<0.01),with the non-dominant eye showing superior acuity in both instances.

Contrast sensitivity showed no significant difference between the dominant and non-dominant eye (p = 0.06). Significant improvement binocularly was seen through imposed defocus -0.50 to -2.50D)

The RayOne EMV enhanced monofocal with micromonovision is a reliable method for reducing spectacle independence by increasing the range of focus particularly through the intermediate range without compromise of distance acuity or contrast sensitivity.