Abstract
Purpose To compare the visual performance and astigmatism tolerance of 3 intraocular lens (IOL) groups: monofocal, bifocal, and extended depth-of-focus (EDOF) IOLs targeting slight myopia. Methods Overall, there were 60 cataract surgery eyes from 60 patients with implantation of a monofocal, bifocal, or EDOF IOL (20 eyes in each IOL group). The EDOF IOLs targeted slight myopia (−0.25 D to −0.75 D). Intragroup comparison of visual acuity, defocus curve, objective optical quality, contrast sensitivity, visual function questionnaire scores, patients' overall satisfaction, and the astigmatism tolerance was performed 3 months after surgery. Results The EDOF group provided equivalently excellent distance visual outcomes (0.06 ± 0.12) as the monofocal (0.06 ± 0.09) and bifocal (0.03 ± 0.09) groups (P=0.554), better intermediate vision than the other 2 groups (P < 0.05), and similarly satisfactory near visual outcomes (0.23 ± 0.16 at 20 cm, and 0.17 ± 0.14 at 33 cm) as the bifocal group (0.28 ± 0.14 at 20 cm and 0.08 ± 0.10 at 33 cm) (P > 0.05). The contrast sensitivity of EDOF IOL was slightly decreased compared to that of monofocal IOL, but it was better than that of bifocal IOL. The EDOF group showed significantly higher satisfaction than the bifocal group did when preoperative corneal astigmatism was 0.75 D or greater (P=0.009). A significant negative correlation between the corneal astigmatism and patient satisfaction was observed in only the bifocal group. Conclusions The EDOF IOLs targeting slight myopia offered satisfactory visual outcomes at an extended range from far to near distances. The EDOF and monofocal IOLs showed a better tolerance to astigmatism than did the bifocal IOL.
Highlights
New intraocular lens (IOL) designs are focused on improving both distance and intermediate vision, while maintaining an adequate near vision, as well as minimizing the dysphotopsia phenomena associated with traditional multifocal IOLs [1, 2]. e extended depth-of-focus (EDOF) IOL was recently developed based on the elongated focus, thereby minimizing the dysphotopsia phenomena induced by multifocality and providing better optical quality on the whole addition range [2, 3]
A recently published study demonstrated that the eyes with implantation of EDOF IOL aimed for −0.75 D myopia provided better uncorrected near vision and similar uncorrected intermediate vision compared with the emmetropia eyes and maintained excellent distance vision outcomes at the same time [7]
60 eyes from 60 participants were included in this study, and 20 eyes were included in each IOL group
Summary
New IOL designs are focused on improving both distance and intermediate vision, while maintaining an adequate near vision, as well as minimizing the dysphotopsia phenomena associated with traditional multifocal IOLs [1, 2]. e extended depth-of-focus (EDOF) IOL was recently developed based on the elongated focus, thereby minimizing the dysphotopsia phenomena induced by multifocality and providing better optical quality on the whole addition range [2, 3]. New IOL designs are focused on improving both distance and intermediate vision, while maintaining an adequate near vision, as well as minimizing the dysphotopsia phenomena associated with traditional multifocal IOLs [1, 2]. A recently published study demonstrated that the eyes with implantation of EDOF IOL aimed for −0.75 D myopia provided better uncorrected near vision and similar uncorrected intermediate vision compared with the emmetropia eyes and maintained excellent distance vision outcomes at the same time [7]. E main purpose of this study was to compare visual performance and astigmatism tolerance of the new EDOF IOL with those of the monofocal IOL and bifocal IOL and to evaluate the benefits of intended slight myopia in the EDOF IOL
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