The Clinical Importance of Angle Alpha by Multifocal Intraocular Lenses.

The Impact of Visual Axis Position on the Optical Quality After Implantation of Multifocal Intraocular Lenses With Different Asphericity Values

Status

Completed

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT04274088

Enrollment

Registered

2020-02-18

Start date

2014-10-31

Completion date

2018-10-31

Last updated

2020-02-21

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

IOL, Cataract

Keywords

multifocal IOL, optical quality, angle alpha

Brief summary

Purpose: to evaluate the effect of visual axis positioning on the optical performance of the Tecnis MIOL and the Diff-aA MIOL.

Detailed description

In this prospective, randomized comparative study 70 eyes of 35 subjects with senile cataract were implanted with the spherical aberration correcting diffractive, bifocal Tecnis ZLB00 IOL, and 60 eyes of 30 age matched subjects with the spherical aberration neutral, diffractive, bifocal Diffractiva IOL. Observation Procedure was performed 1, 3, 6 months postoperatively. Main Outcome Measures included uncorrected and corrected distance and near visual acuity, manifest refraction, ocular aberrations and visual quality metrics with 2mm and 4mm pupil, and the position of visual axis.

Interventions

PROCEDURECataract surgery

Phacoemulsification surgery

Study design

Observational model

COHORT

Time perspective

PROSPECTIVE

Eligibility

Sex/Gender

ALL

Age

18 Years to 80 Years

Inclusion criteria

* corneal astigmatism less than 1 diopter

Exclusion criteria

* ocular pathology others than cataract

Design outcomes

Primary

Measure	Time frame	Description
Visual Acuity	6 Month	Schnellen VA

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 24, 2026