Visual acuity and refraction with a diffractive multifocal toric intraocular lens.

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Optics

Background:

• The development of advanced intraocular lenses (IOLs) aims to address presbyopia and astigmatism concurrently.
• Toric intraocular lenses correct astigmatism, while multifocal IOLs address refractive errors at multiple distances.

Purpose of the Study:

• To assess the clinical outcomes and optical performance of the AT Lisa 909M diffractive multifocal toric intraocular lens (IOL).

Main Methods:

• A multicenter cohort study evaluated 284 eyes of 142 patients implanted with the AT Lisa 909M IOL.
• Outcomes included refractive error, visual acuities (distance, near, intermediate), defocus curve, rotational stability, and contrast sensitivity.
• Astigmatism was analyzed using Alpins vector analysis.

Main Results:

• At 6 months post-implantation, 89.4% of eyes were within ±1.00 diopter of emmetropia.
• Mean refractive cylinder significantly decreased, with 80.9% of eyes having less than 1.00 D.
• Excellent uncorrected and corrected visual acuities were achieved at distance, near, and intermediate ranges; 95.8% of IOLs demonstrated stable rotation.

Conclusions:

• The AT Lisa 909M is the first commercially available diffractive multifocal toric IOL studied extensively.
• Results demonstrate its efficacy, predictability, and safety in visual rehabilitation.
• The IOL successfully provides spectacle independence for patients with significant corneal astigmatism.