Comparison of Visual Function in Patients With Multifocal Toric and Monofocal Toric IOLs
Narrative Responses:
Purpose
To compare visual acuity (VA) from far to near distances, and contrast visual acuity (contrast VA) between patients with multifocal toric intraocular lenses (IOLs) and those with bilateral monofocal toric IOLs.
Methods
Sixty-six eyes of 33 patients scheduled for implantation of diffractive multifocal toric IOLs (Alcon ReSTOR Toric; SND1T) with preoperative corneal astigmatism between 0.75 diopter (D) and 2.82D were recruited. Sixty-six eyes of 33 patients scheduled for bilateral implantation of monofocal toric IOLs (SN6AT) with the same range of corneal astigmatism served as controls. At 3 months postoperatively, monocular and binocular uncorrected or corrected VA from far to near distances was measured using an all-distance vision tester, and monocular and binocular contrast VA under photopic and mesopic conditions were measured using the contrast sensitivity tester.
Results
Postoperatively, the mean refractive astigmatism decreased to 0.71 D in the multi-toric group and 0.74 D in the mono-toric group. For monocular and binocular VA, mean uncorrected and corrected near VA at 0.3 m and intermediate VA at 0.5 m were significantly better in the multi-toric group than in the mono-toric group (P≤0.0011), while mean VA at other distances was similar between groups. Mean binocular photopic and mesopic contrast VA at high to moderate contrasts did not differ significantly between groups, but that at low contrasts was significantly worse in the multi-toric group than in the mono-toric group (P≤0.0429).
Conclusion
A diffractive multifocal toric IOL decreased the refractive astigmatism to an acceptable range for multifocal IOLs in eyes with excessive preexisting corneal astigmatism, and provided useful VA at any distance and significantly better near VA and intermediate VA than a monofocal toric IOL.