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Acute Ocular Effects of Cigarette Smoking

5. maj 2026 opdateret af: Semih Çakmak, Istanbul University

Acute Effects of Cigarette Smoking on Corneal Tomographic and Biometric Parameters: A Prospective Controlled Study

This prospective study aims to evaluate the short-term effects of smoking on corneal tomographic and biometric measurements in healthy adults. After baseline examinations and measurements are taken in both smoking and non-smoking participants, the same measurements will be repeated after 10 minutes of external exposure, and within-group and between-group changes will be compared. The aim of the study is to determine whether acute smoking exposure leads to measurable immediate changes in corneal tomographic and biometric parameters.

Studieoversigt

Status

Rekruttering

Betingelser

Intervention / Behandling

Detaljeret beskrivelse

This study is a single-center, prospective, and controlled study designed to evaluate the short-term effects of smoking on corneal tomographic and biometric measurements in healthy adults. The study aimed to include 46 smokers and 46 non-smokers. To avoid inter-eye correlation, only the right eye of each participant was evaluated. All participants initially underwent a full ophthalmological examination and measurements were taken using a Pentacam device. Afterward, all participants waited in standard outdoor conditions for 10 minutes. During this time, participants in the smoking group smoked, while participants in the control group did not smoke. The same measurements were repeated at the end of the period. The study aimed to compare within-group and between-group differences in changes.

Undersøgelsestype

Observationel

Tilmelding (Anslået)

90

Kontakter og lokationer

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

Studiekontakt

Studiesteder

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

  • Voksen

Tager imod sunde frivillige

Ja

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

Healthy adult smokers and non-smokers aged 18 to 60 years are planned to be included in this single-center study.

Beskrivelse

Inclusion Criteria:

  • Healthy adults aged 18 to 60 years
  • Current smokers in the smoking group
  • Never-smokers in the control group
  • Willing and able to undergo ophthalmic examination and Pentacam AXL measurements

Exclusion Criteria:

  • History of ocular surgery or ocular trauma
  • Presence of corneal disease, retinal disease, or ocular surface disorder
  • Clinically significant dry eye disease
  • Contact lens use within the last 2 weeks
  • Use of medications that may affect the ocular surface or pupillary dynamics, including anticholinergics or sympathomimetics
  • Systemic diseases such as diabetes mellitus or hypertension
  • Former smoking history in the control group
  • Use of electronic cigarettes or other tobacco products
  • Inability to cooperate adequately for accurate measurement

Studieplan

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

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

Kohorter og interventioner

Gruppe / kohorte
Intervention / Behandling
Smokers
Healthy adult participants with active cigarette smoking exposure who underwent baseline ophthalmic examination and Pentacam measurements, followed by repeat measurements after a standardized 10-minute outdoor period during which they smoked.
Andet: Cigarette Smoking Exposure
Participants in the smoking group smoked cigarettes during a standardized 10-minute outdoor period between baseline and post-exposure assessments.
Non-smokers
Healthy adult participants without cigarette smoking exposure who underwent baseline ophthalmic examination and Pentacam measurements, followed by repeat measurements after a standardized 10-minute outdoor period under the same environmental conditions without smoking.
Andet: No Smoking Exposure
Participants in the control group remained in the same outdoor environment for 10 minutes without smoking between baseline and post-exposure assessments.

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Change in Pentacam-measured corneal pachymetry at the pupil center after acute cigarette smoking exposure
Tidsramme: Baseline and immediately after a standardized 10-minute outdoor exposure period
Change (post-exposure minus baseline) in corneal pachymetry at the pupil center, measured in micrometers (µm) using Pentacam. The magnitude of change will be compared between smokers and non-smokers.
Baseline and immediately after a standardized 10-minute outdoor exposure period

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Change in Pentacam-measured corneal densitometry in the anterior 0-2 mm zone after acute cigarette smoking exposure
Tidsramme: Baseline and immediately after a standardized 10-minute outdoor exposure period
Change (post-exposure minus baseline) in corneal densitometry in the anterior 0-2 mm zone, measured in grayscale units (GSU) using Pentacam. The magnitude of change will be compared between smokers and non-smokers.
Baseline and immediately after a standardized 10-minute outdoor exposure period

Samarbejdspartnere og efterforskere

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

Sponsor

Istanbul University

Efterforskere

  • Ledende efterforsker: Semih Çakmak, Istanbul 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)

15. februar 2026

Primær færdiggørelse (Anslået)

1. maj 2026

Studieafslutning (Anslået)

1. maj 2026

Datoer for studieregistrering

Først indsendt

17. april 2026

Først indsendt, der opfyldte QC-kriterier

5. maj 2026

Først opslået (Faktiske)

12. maj 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

12. maj 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

5. maj 2026

Sidst verificeret

1. maj 2026

Mere information

Begreber relateret til denne undersøgelse

Nøgleord

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • IstanbulU-2026-3901546

Plan for individuelle deltagerdata (IPD)

Planlægger du at dele individuelle deltagerdata (IPD)?

INGEN

IPD-planbeskrivelse

Individual participant data will not be shared because the study was not designed with a data-sharing plan and the dataset contains participant-level information.

Lægemiddel- og udstyrsoplysninger, undersøgelsesdokumenter

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Ingen

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Ingen

produkt fremstillet i og eksporteret fra U.S.A.

Ingen

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Kliniske forsøg med Hornhinde

Kliniske forsøg med Cigarette Smoking Exposure

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Betingelser

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Narkotikainterventioner

Kosttilskud

Sponsor / samarbejdspartnere

Placeringer

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