Visual Performance of Two Diffractive Trifocal Intraocular Lenses: A Randomized Trial

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Optics

Background:

• Cataract surgery is a common procedure to restore vision.
• Trifocal intraocular lenses (IOLs) offer improved visual function by providing multiple focal points.
• Comparing different IOL designs is crucial for optimizing patient outcomes.

Purpose of the Study:

• To compare the optical and capsular bag performance of two trifocal IOLs: RayOne Trifocal (closed-loop haptic) and AT Lisa tri (plate-haptic).

Main Methods:

• A comparative study involving 44 patients who received one type of IOL in one eye and the other type in the fellow eye.
• Postoperative assessments included visual acuity, objective reading tests, defocus curves, IOL tilt/decentration, and questionnaires on dysphotopsia and halos.

Main Results:

• Visual acuity was comparable between the closed-loop haptic IOL and the plate-haptic IOL.
• The closed-loop haptic IOL showed superior performance in the defocus curve.
• The plate-haptic IOL demonstrated better contrast sensitivity and reduced subjective disturbances like starbursts.

Conclusions:

• Both trifocal IOLs provide good visual function and low levels of dysphotopsia.
• The closed-loop haptic IOL excels in defocus performance, while the plate-haptic IOL offers advantages in contrast sensitivity and positive dysphotopsia.
• Patient outcomes are favorable with both IOL designs, with specific strengths for each.