Visual Performance in Intraocular Lens Implantation

The replacement of the natural lens with an intraocular lens (IOL) in cataract and refractive surgery presents multiple opportunities to restore and optimise visual function. Visual performance in IOL implantation is assessed not only by distance acuity but also by intermediate and near acuities, contrast sensitivity and the incidence of dysphotopsia. Innovations in IOL design—monofocal with extended intermediate focus, multifocal diffractive, extended depth of focus (EDOF) and hybrid approaches—have broadened functional range and spectacle independence while balancing phenomena such as glare and halos. Global multicentre evaluations and bench-to-clinic correlations continue to refine lens geometry, material properties and positioning for personalised visual rehabilitation worldwide.

Research from Nature Portfolio

Meta-analytic evidence indicates that trifocal designs afford superior intermediate acuity compared with bifocal lenses without compromising distance or near vision. Although contrast sensitivity outcomes are heterogeneous, newer diffractive iterations yield improved near vision, greater spectacle independence and a reduced incidence of photic phenomena relative to older models. These findings underscore the evolving balance between multifocality and optical clarity in lens engineering.

Visual Performance in Intraocular Lens Implantation publication trend

The graph below shows the total number of articles in visual performance in intraocular lens implantation across all publications each year (not limited to Nature Index journals).

Technical terms

Intraocular lens (IOL): An artificial implant replacing the eye’s crystalline lens to restore focus after cataract or refractive surgery.

Diffractive IOL: A lens using microstructured rings or steps to split incoming light into multiple focal points, enabling simultaneous far, intermediate and near vision.

Extended depth of focus (EDOF): A design that elongates a single focal zone to enhance intermediate vision while preserving distance clarity without distinct near foci.

Defocus curve: A graph plotting visual acuity across a range of induced dioptric defocus to assess the functional range of an IOL.

Contrast sensitivity: The ability to discern subtle differences in luminance between adjacent areas, reflecting real-world visual quality beyond high-contrast acuity.

References

1. Unilateral intraindividual comparison and bilateral performance of a monofocal spherical and diffractive extended depth of field intraocular lens mix‐and‐match approach. Clinical and Experimental Ophthalmology (2023).
2. Visual and patient-reported outcomes of a diffractive trifocal intraocular lens in highly myopic eyes: a prospective multicenter study. Eye and Vision (2023).
3. Clinical evaluation of a new monofocal IOL with enhanced intermediate function in patients with cataract.. Journal of Cataract & Refractive Surgery (2021).
4. Clinical comparison of patient outcomes following implantation of trifocal or bifocal intraocular lenses: a systematic review and meta-analysis. Scientific Reports (2017).