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Effect of Dry Eye Treatment on Corneal Astigmatism Measurements

15. juni 2026 opdateret af: 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.

Studieoversigt

Status

Rekruttering

Betingelser

Intervention / Behandling

Undersøgelsestype

Interventionel

Tilmelding (Anslået)

400

Fase

  • Ikke anvendelig

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiekontakt

Undersøgelse Kontakt Backup

Studiesteder

  • Kina
    • Shanghai Municipality
      • Shanghai, Shanghai Municipality, Kina, 200000
        • Rekruttering
        • Eye and ENT hospital of Fudan University
        • Kontakt:

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

  • Barn
  • Voksen
  • Ældre voksen

Tager imod sunde frivillige

Ingen

Beskrivelse

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

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Behandling
  • Tildeling: Ikke-randomiseret
  • Interventionel model: Parallel tildeling
  • Maskning: Ingen (Åben etiket)

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Ingen indgriben: 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.
Eksperimentel: 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.
Medicin: Sodium Hyaluronate Eye Drops
0.3% sodium hyaluronate eye drops administered four times daily for 2 weeks in participants with dry eye disease.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Interdevice Agreement of Corneal Astigmatism Measurements
Tidsramme: 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
Tidsramme: 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.

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Sponsor

Jin Yang

Efterforskere

  • Studiestol: Xuanqiao Lin, Doctor, Fudan University

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart (Faktiske)

1. januar 2026

Primær færdiggørelse (Anslået)

31. juli 2026

Studieafslutning (Anslået)

31. december 2030

Datoer for studieregistrering

Først indsendt

15. juni 2026

Først indsendt, der opfyldte QC-kriterier

15. juni 2026

Først opslået (Faktiske)

18. juni 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

18. juni 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

15. juni 2026

Sidst verificeret

1. juni 2026

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • DryEye-2026-001

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

INGEN

IPD-planbeskrivelse

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.

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

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