Effect of Dry Eye Treatment on Corneal Astigmatism Measurements

June 15, 2026 updated by: Jin Yang

Effect of Dry Eye and Ocular Surface Treatment on Agreement and Repeatability of Corneal Astigmatism Measurements Among Three Devices

This prospective single-center study evaluates the effect of dry eye disease and short-term ocular surface treatment on the agreement and repeatability of corneal astigmatism measurements in patients with age-related cataract. Participants undergoing preoperative cataract evaluation are classified into a control group or a dry eye disease group according to ocular surface symptoms and objective tear film findings.

All participants undergo ocular surface assessment and repeated corneal measurements using three commonly used devices: IOLMaster 700, Pentacam AXL, and iTrace Prime. Measurements include keratometric corneal astigmatism, total corneal astigmatism, and vector components of astigmatism. Patients with dry eye disease receive 0.3% sodium hyaluronate eye drops four times daily for 2 weeks, after which ocular surface assessment and device measurements are repeated.

The primary objective is to determine whether dry eye disease reduces interdevice agreement and test-retest repeatability of corneal astigmatism measurements, and whether short-term ocular surface treatment improves measurement stability. Interdevice agreement is assessed using Bland-Altman analysis, and repeatability is evaluated using within-subject standard deviation, test-retest repeatability, and intraclass correlation coefficient.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Study Type

Interventional

Enrollment (Estimated)

400

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

Study Locations

  • China
    • Shanghai Municipality
      • Shanghai, Shanghai Municipality, China, 200000
        • Recruiting
        • Eye and ENT hospital of Fudan University
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Patients with age-related cataract undergoing preoperative ocular examination.
  • Ability to complete ocular surface evaluation, including the Ocular Surface
  • Disease Index questionnaire, non-invasive tear film break-up time, tear meniscus height, Schirmer test, and ocular surface staining.
  • Ability to complete repeated corneal astigmatism measurements using IOLMaster 700, Pentacam AXL, and iTrace Prime.
  • Ability to maintain stable fixation during device measurements. Provision of written informed consent.

Exclusion Criteria:

  • Previous ocular surgery or ocular trauma.
  • Corneal degeneration, corneal dystrophy, or other corneal diseases that could affect corneal measurements.
  • Active corneal or conjunctival infection.
  • Uveitis.
  • Use of any topical eye drops within 24 hours before examination.
  • Use of antiglaucoma medications.
  • Contact lens wear within 1 month before examination.
  • Previous or ongoing treatment for dry eye disease.
  • Poor fixation during device measurements.
  • Poor-quality measurements from any study device

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
No Intervention: Control Cohort
Patients with age-related cataract who did not meet the diagnostic criteria for dry eye disease. Participants underwent ocular surface evaluation and repeated corneal astigmatism measurements using IOLMaster 700, Pentacam AXL, and iTrace Prime. No ocular surface treatment was administered in this cohort.
Experimental: Dry Eye Disease Cohort
Patients with age-related cataract who met the diagnostic criteria for dry eye disease. Participants underwent baseline ocular surface evaluation and repeated corneal astigmatism measurements using IOLMaster 700, Pentacam AXL, and iTrace Prime. They then received 0.3% sodium hyaluronate eye drops four times daily for 2 weeks, followed by repeat ocular surface evaluation and device measurements using the same protocol.
Drug: Sodium Hyaluronate Eye Drops
0.3% sodium hyaluronate eye drops administered four times daily for 2 weeks in participants with dry eye disease.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Interdevice Agreement of Corneal Astigmatism Measurements
Time Frame: Baseline and 2 weeks after ocular surface treatment in the dry eye disease arm.
Interdevice agreement of corneal astigmatism measurements among IOLMaster 700, Pentacam AXL, and iTrace Prime will be assessed using Bland-Altman analysis. Pairwise comparisons will be performed for IOLMaster 700 versus Pentacam AXL, IOLMaster 700 versus iTrace Prime, and Pentacam AXL versus iTrace Prime. The main parameters include keratometric corneal astigmatism, total corneal astigmatism, and their vector components J0 and J45. The mean difference and 95% limits of agreement will be calculated.
Baseline and 2 weeks after ocular surface treatment in the dry eye disease arm.
Test-Retest Repeatability of Corneal Astigmatism Measurements
Time Frame: Baseline and 2 weeks after ocular surface treatment in the dry eye disease arm.
Test-retest repeatability of corneal astigmatism measurements obtained using IOLMaster 700, Pentacam AXL, and iTrace Prime will be evaluated using three consecutive valid measurements from each device. The main parameters include keratometric corneal astigmatism, total corneal astigmatism, and their vector components J0 and J45. Repeatability will be assessed using within-subject standard deviation, test-retest repeatability calculated as 2.77 times the within-subject standard deviation, and intraclass correlation coefficient with 95% confidence intervals.
Baseline and 2 weeks after ocular surface treatment in the dry eye disease arm.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Jin Yang

Investigators

  • Study Chair: Xuanqiao Lin, Doctor, Fudan University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

January 1, 2026

Primary Completion (Estimated)

July 31, 2026

Study Completion (Estimated)

December 31, 2030

Study Registration Dates

First Submitted

June 15, 2026

First Submitted That Met QC Criteria

June 15, 2026

First Posted (Actual)

June 18, 2026

Study Record Updates

Last Update Posted (Actual)

June 18, 2026

Last Update Submitted That Met QC Criteria

June 15, 2026

Last Verified

June 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • DryEye-2026-001

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

IPD Plan Description

Individual participant data will not be shared because the dataset contains patient-level clinical examination data. Deidentified aggregate data may be available from the corresponding author upon reasonable request, subject to institutional approval and applicable privacy regulations.

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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