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Ocular Changes in Patients Using Tirzepatide or Semaglutide

3 november 2026 bijgewerkt door: Derya Budak Behrad, Istanbul University

Evaluation of Optic Nerve Head, Retinal Changes, and Choroidal Blood Flow in Patients With Diabetes and Obesity Using Tirzepatide or Semaglutide

This prospective observational study aims to evaluate ocular structural and microvascular changes in adults with obesity who are receiving semaglutide or tirzepatide as part of routine clinical care. Participants with and without type 2 diabetes mellitus will be included.

Participants will undergo ophthalmologic examinations at baseline and during follow-up. Changes in optic nerve head parameters, retinal thickness, retinal and choroidal microvascular parameters, and choroidal thickness will be assessed using optical coherence tomography (OCT), optical coherence tomography angiography (OCT-A), and other routine ophthalmologic examination methods.

The study will compare ocular measurements obtained at baseline and during follow-up to investigate changes associated with semaglutide or tirzepatide treatment over a period of up to 18 months.

Studie Overzicht

Toestand

Werving

Conditie

Interventie / Behandeling

Gedetailleerde beschrijving

This prospective observational cohort study will evaluate ocular structural and microvascular changes in adults with obesity receiving semaglutide or tirzepatide as part of routine clinical care. Participants will include individuals with and without type 2 diabetes mellitus.

The study population will be divided into four observational cohorts according to diabetes status and medication use:

  • Participants with obesity and type 2 diabetes receiving semaglutide.
  • Participants with obesity and type 2 diabetes receiving tirzepatide.
  • Participants with obesity without type 2 diabetes receiving semaglutide.
  • Participants with obesity without type 2 diabetes receiving tirzepatide.

Participants will undergo ophthalmologic examinations at baseline and during follow-up for up to 18 months. Assessments will include visual acuity, slit-lamp examination, intraocular pressure measurement, fundus examination, optical coherence tomography (OCT), optical coherence tomography angiography (OCT-A), and enhanced depth imaging optical coherence tomography (EDI-OCT).

The study will evaluate changes in retinal nerve fiber layer thickness, retinal thickness, superficial and deep retinal vessel density, foveal avascular zone area, choriocapillaris flow deficit percentage, and choroidal thickness. Changes in visual acuity and intraocular pressure will also be assessed.

Ocular measurements obtained at baseline and during follow-up will be compared to investigate structural and microvascular changes associated with semaglutide or tirzepatide treatment. Differences between the observational cohorts may also be evaluated.

All medications will be prescribed by the treating physicians as part of routine clinical care. Treatment selection will not be determined by the study protocol, and no experimental ophthalmologic intervention will be performed.

Studietype

Observationeel

Inschrijving (Geschat)

40

Contacten en locaties

In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.

Studie Locaties

  • Turkije (Türkiye)
    • Istanbul
      • Istanbul, Istanbul, Turkije (Türkiye), 34093
        • Werving
        • Istanbul University, Istanbul Faculty of Medicine
        • Contact:
        • Contact:
          • ADEM TELLIOGLU, MD
          • Telefoonnummer: +90 5066107361

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

18 jaar en ouder (Volwassen, Oudere volwassene)

Accepteert gezonde vrijwilligers

Nee

Geslachten die in aanmerking komen voor studie

Allemaal

Bemonsteringsmethode

Niet-waarschijnlijkheidssteekproef

Studie Bevolking

Adults with obesity who are receiving semaglutide or tirzepatide as part of routine clinical care will be included. Participants will include individuals with and without type 2 diabetes mellitus. The study population will be evaluated in four observational cohorts according to diabetes status and medication: obesity with diabetes receiving semaglutide, obesity with diabetes receiving tirzepatide, obesity without diabetes receiving semaglutide, and obesity without diabetes receiving tirzepatide.

Beschrijving

Inclusion Criteria:

  • Age 18 years or older
  • Diagnosis of obesity
  • Receiving semaglutide or tirzepatide as part of routine clinical care
  • Participants with or without type 2 diabetes mellitus
  • Availability for baseline and follow-up ophthalmologic examinations

Exclusion Criteria:

  • Age under 18 years
  • Not receiving semaglutide or tirzepatide
  • Inability to complete the required ophthalmologic examinations or imaging assessments

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

  • Observatiemodellen: COHORT
  • Tijdsperspectieven: PROSPECTIVE

Cohorten en interventies

Groep / Cohort
Interventie / Behandeling
Obesity With Diabetes - Semaglutide

Participants with obesity and diabetes receiving semaglutide as part of routine clinical care.
Geneesmiddel: Semaglutide

Semaglutide is prescribed as part of routine clinical care. Treatment is not assigned by the study protocol. Ocular structural and vascular parameters are evaluated before treatment and during follow-up.
Obesity With Diabetes - Tirzepatide

Participants with obesity and diabetes receiving tirzepatide as part of routine clinical care
Geneesmiddel: Tirzepatide

Tirzepatide is prescribed as part of routine clinical care. Treatment is not assigned by the study protocol. Ocular structural and vascular parameters are evaluated before treatment and during follow-up.
Obesity Without Diabetes - Semaglutide

Participants with obesity without diabetes receiving semaglutide as part of routine clinical care
Geneesmiddel: Semaglutide

Semaglutide is prescribed as part of routine clinical care. Treatment is not assigned by the study protocol. Ocular structural and vascular parameters are evaluated before treatment and during follow-up.
Obesity Without Diabetes - Tirzepatide

Participants with obesity without diabetes receiving tirzepatide as part of routine clinical care
Geneesmiddel: Tirzepatide

Tirzepatide is prescribed as part of routine clinical care. Treatment is not assigned by the study protocol. Ocular structural and vascular parameters are evaluated before treatment and during follow-up.

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Change in Retinal Nerve Fiber Layer Thickness
Tijdsspanne: Baseline to up to 18 months

Change in retinal nerve fiber layer thickness from baseline during follow-up, assessed using optical coherence tomography (OCT).
Baseline to up to 18 months
Change in Retinal Thickness
Tijdsspanne: Baseline to up to 18 months

Change in retinal thickness from baseline during follow-up, assessed using optical coherence tomography (OCT).
Baseline to up to 18 months
Change in Superficial Retinal Vessel Density
Tijdsspanne: Baseline to 18 months

Change in superficial retinal capillary vessel density from baseline to follow-up, assessed using optical coherence tomography angiography (OCT-A) and expressed as a percentage (%).
Baseline to 18 months
Change in Deep Retinal Vessel Density
Tijdsspanne: Baseline to 18 months

Change in deep retinal capillary vessel density from baseline to follow-up, assessed using optical coherence tomography angiography (OCT-A) and expressed as a percentage (%).
Baseline to 18 months
Change in Foveal Avascular Zone Area
Tijdsspanne: Baseline to 18 months

Change in foveal avascular zone (FAZ) area from baseline to follow-up, measured using optical coherence tomography angiography (OCT-A) and expressed in square millimeters (mm²).
Baseline to 18 months
Change in Choriocapillaris Flow Deficit Percentage
Tijdsspanne: Baseline to 18 months

Change in choriocapillaris flow deficit percentage from baseline to follow-up, assessed using optical coherence tomography angiography (OCT-A) and expressed as a percentage (%).
Baseline to 18 months

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Change in Visual Acuity
Tijdsspanne: Baseline to up to 18 months

Change in visual acuity from baseline during follow-up
Baseline to up to 18 months
Change in Intraocular Pressure
Tijdsspanne: Baseline to up to 18 months

Change in intraocular pressure from baseline during follow-up, measured in mmHg during routine ophthalmologic examination.
Baseline to up to 18 months

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Sponsor

Istanbul University

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start (Werkelijk)

1 maart 2026

Primaire voltooiing (Geschat)

17 september 2027

Studie voltooiing (Geschat)

17 september 2027

Studieregistratiedata

Eerst ingediend

28 oktober 2026

Eerst ingediend dat voldeed aan de QC-criteria

3 november 2026

Eerst geplaatst (Werkelijk)

9 november 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

9 november 2026

Laatste update ingediend die voldeed aan QC-criteria

3 november 2026

Laatst geverifieerd

1 oktober 2026

Meer informatie

Termen gerelateerd aan deze studie

Aanvullende relevante MeSH-voorwaarden

Andere studie-ID-nummers

  • 2025/2444

Plan Individuele Deelnemersgegevens (IPD)

Bent u van plan om gegevens van individuele deelnemers (IPD) te delen?

NEE

Informatie over medicijnen en apparaten, studiedocumenten

Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel

Ja

Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct

Nee

product vervaardigd in en geëxporteerd uit de V.S.

Nee

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