Optimizing the Assessment of Refractive Outcomes After Cataract Surgery

The purpose of this study is to evaluate current available assessments (automated vs. manual) with which manifest refraction data and biometric variables are obtained to understand if data from an automated refractor can be utilized to optimize the A-constant as well as manual subjective refraction (ie, to a clinically insignificant difference). The A-constant is the calculated number that helps the surgeon determine which IOL should be implanted in the eye during cataract surgery.

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Key information

Conditions

Cataract Eye Diseases Lens Diseases

Age range

22 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

About this study

Subjects will be implanted with ACRYSOF® IQ Monofocal IOL Model SN60WF. Standard clinical practice will be followed for pre-operative testing, IOL power estimation and IOL implantation. Only one eye will be enrolled in the study per surgeon determination. The eye will undergo both an automated and manual manifest refraction assessment at 3 months postoperative.

Who can participate

Healthy volunteers accepted: No

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Able to understand and sign an Ethics Committee/Institutional Review Board approved Informed Consent;
Willing and able to attend all scheduled study visits as required per protocol;
Diagnosed with cataract in one or both eyes;
Planned cataract removal by phacoemulsification with implantation of a monofocal IOL; laser refractive procedures for incisions (primary and sideport), capsulorhexis and lens fragmentation are allowed;
Preoperative keratometric astigmatism ≤ 1.0 diopter (D);
Other protocol-defined inclusion criteria may apply.

Exclusion criteria

Women of childbearing potential, pregnant, or breast-feeding;
History of ocular pathology, ocular inflammation, or ocular conditions, as specified in the protocol;
Previous intraocular or corneal surgery;
Use of systemic medications that, in the opinion of the Investigator, may confound the outcome or increase the risk of complications to the subject;
Any medical condition that, in the opinion of the Investigator, may confound the results of this study, prohibit the completion of the study assessments, or increase the risk for the subject;
Other protocol-defined exclusion criteria may apply.

Treatment and study plan

manifest refraction

Procedure

Manifest refraction performed by autorefraction (automated) and manual procedures (standard)

ACRYSOF® IQ Monofocal IOL Model SN60WF

Device

Monofocal IOL implanted for long-term use over the lifetime of the cataract patient

Topcon® KR-1W Wave-Front Analyzer

Device

Wavefront and topography system used to obtain autorefraction data

Primary outcomes

IOL A-constant at 3 Months at Each Site

Time frame: Month 3 (Day 80-100) Post Study Eye Implantation

The A-constant, is a type of IOL constant, that accounts for clinical variables that may affect the refractive outcome (e.g. patient factors, biometry method). It relates the power of the IOL to axial length and corneal measurements. It is specific to the design of the IOL, style, and placement within the eye. The optimization of the A-constant is fundamental to achieving the targeted refractive outcomes, offset any observed error and for ensuring high patient satisfaction following cataract surgery. Since errors/noise from refraction plays a significant role in A-constant optimization, it is important to determine if an automated method has any advantages over conventional manifest refraction. A-constants based on autorefraction and manifest refraction for the study eye are compared for each subject. The mean difference between the two methods cannot be greater than 0.15 D at each of the three study centers for the methods to be considered equivalent.

Sponsors and collaborators

Lead sponsor

Alcon Research

Industry

Registry information

Official study title

Optimizing the Assessment of Refractive Outcomes After Cataract Surgery and Implantation of a Monofocal IOL

Important dates

Study start: 2016
Primary completion: 2017
Study completion: 2017
First posted: Jul 22, 2016
Registry last updated: Jan 8, 2019

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

Published trials that share one or more normalized conditions with this study.

Completed