Binocular visual function with a diffractive multifocal intraocular lens in patients with unilateral cataract

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Vision Science

Background:

• Unilateral cataract presents a challenge for visual rehabilitation.
• Intraocular lens (IOL) technology aims to restore vision after cataract surgery.
• Multifocal IOLs offer potential for improved uncorrected vision at multiple distances.

Purpose of the Study:

• To compare binocular visual function after unilateral cataract surgery using monocular implantation of a multifocal intraocular lens (IOL) versus a monofocal IOL.
• To evaluate the impact of IOL type on visual acuity, contrast sensitivity, and stereoacuity.

Main Methods:

• A nonrandomized comparative study was conducted.
• Patients with unilateral cataract received either a diffractive multifocal IOL or a monofocal IOL.
• Binocular visual function, including visual acuity at various distances, contrast sensitivity with and without glare, and stereoacuity, was assessed three months postoperatively.

Main Results:

• The multifocal IOL group demonstrated significantly better binocular uncorrected and corrected near and intermediate visual acuity.
• Spectacle independence was significantly higher in the multifocal IOL group.
• However, the multifocal IOL group exhibited significantly worse binocular photopic contrast visual acuity, glare visual acuity, and mesopic glare visual acuity.

Conclusions:

• Monocular implantation of a diffractive multifocal IOL in unilateral cataract patients enhances binocular near and intermediate vision and spectacle independence.
• Distance contrast sensitivity is compromised with multifocal IOLs compared to monofocal IOLs.
• The findings suggest a trade-off between near/intermediate vision and distance contrast sensitivity when using multifocal IOLs.