Visual outcomes, contrast sensitivity, and defocus profile with an aspheric monofocal intraocular lens using positive spherical aberration

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PURPOSE: To evaluate visual outcomes after bilateral implantation of the RayOne EMV intraocular lens with targeted micromonovision. SETTING: Southend Private Hospital, Westcliff on Sea, United Kingdom. DESIGN: Retrospective cohort. METHODS: 50 patients (100 eyes) were assessed at 12 to 18 months postoperatively. Emmetropia was targeted in the dominant eye and myopia of -0.50 to -1.00 diopter (D) in the nondominant eye. Uncorrected (UDVA) and corrected (CDVA) distance visual acuity was assessed monocularly and binocularly at distance (6 m), intermediate (70 cm), and near (40 cm). Defocus was assessed from +1.50 to -4.00 D monocularly and binocularly. Contrast sensitivity was assessed using a computerized Pelli-Robson chart. RESULTS: Mean spherical equivalent was -0.05 ± 0.34 D and -0.91 ± 0.60 D in the dominant and nondominant eyes, respectively. UDVA was significantly different in the dominant (0.09 ± 0.10 logMAR) and nondominant (0.31 ± 0.18 logMAR) eyes ( P < .01). CDVA, distance corrected intermediate VA (DCIVA), and distance corrected near VA (DCNVA) were similar between eyes. However, significant differences were found between binocular uncorrected intermediate VA (UIVA) (0.16 ± 0.11 logMAR) and DCIVA (0.31 ± 0.11 logMAR) ( P < .01) and between binocular uncorrected near VA (UNVA) (0.30 ± 0.17 logMAR) and DCNVA (0.50 ± 0.19 logMAR) also ( P < .01). The nondominant eye shows superior acuity eye in both UIVA ( P < .01) and UNVA ( P < .01). Contrast sensitivity showed no significant difference between eyes ( P = .06). Significant improvement binocularly compared with monocularly was seen through imposed defocus -0.50 to -2.50 D. CONCLUSIONS: The RayOne EMV with micromonovision is a reliable method for improving intermediate and near VA, by increasing the range of focus without compromise of distance acuity or contrast sensitivity.

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