Purpose: Because the diffractive multifocal intraocular lenses (IOLs) approved within Japan are bifocal, some patients require glasses for intermediate or near vision. We retrospectively investigated postoperative outcomes for trifocal IOLs, which provide a combined distant-intermediate and distant-near diffractive structure.
Subjects and methods: The subjects comprised 54 patients (54 eyes) who requested multifocal IOLs and then further requested trifocal IOLs after receiving an explanation of each type of IOL, including IOLs that are approved for use in Japan. The inserted IOLs were Pod F by PhysIOL (Liege, Belgium) in Group F and Pod FT, which have toric function, in Group T. There were 25 subjects (25 eyes) in Group F and 29 (29 eyes) in Group T. We investigated distant (70 cm), intermediate (50 cm), and near (40 cm) naked visual acuity over 1 month postoperatively, as well as contrast sensitivity, spectacle usage, and IOL deviation in Group T.
Results: Distant naked eye logMAR visual acuity was -0.04 in Group F and -0.06 in Group T. At 70 cm, it was 0.06 in Group F and 0.04 in Group T; at 50 cm, it was 0.09 in Group F and 0.05 in Group T; and for near vision, it was 0.12 in Group F and 0.07 in Group T. Thus, there were no significant differences between the groups. Contrast sensitivity was within the normal range in both groups. Approximately 88.0% of subjects in Group F and all subjects in Group T did not use spectacles. Mean IOL deviation in the toric model was 3.43°±2.27°, and it was not greater than 10° in any of the cases.
Conclusion: Diffractive trifocal IOLs can be used to achieve favorable distant, intermediate, and near visual acuity and are useful for patients who demand a wide visual range.
Nippon Ganka Gakkai Zasshi (J Jpn Ophthalmol Soc) 122: 281-286, 2018.