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Cohort Study on Refractive Errors in Preschool Children (PREC)

Refractive error is a common visual disorder encompassing myopia, hyperopia, astigmatism and other subtypes. Refractive error in preschool children refers to refractive abnormalities occurring during the preschool period (0-6 years old). Studies conducted across diverse regions and populations report that the prevalence of refractive error among preschool children ranges approximately from 10% to 30%, with this proportion showing a gradual upward trend in recent years. Existing evidence suggests that preschool refractive status is correlated with multiple ocular and systemic diseases. Furthermore, the preschool years represent a highly sensitive window for children's visual development; uncorrected refractive errors at this stage can disrupt visual maturation and induce permanent visual impairment. Accordingly, identifying the full spectrum of comorbidities associated with preschool refractive error, alongside implementing early diagnosis and intervention, is clinically critical.

Nevertheless, substantial challenges persist in the clinical management of preschool refractive errors: the complete comorbidity spectrum remains undefined, its natural history has not been fully elucidated, and high-quality evidence-based guidelines for refractive correction and visual rehabilitation are lacking. Establishing a prospective cohort of preschool children with refractive errors is therefore of great significance for clarifying disease progression and risk factors, generating evidence for standardized refractive interventions and visual rehabilitation protocols, and ultimately preventing visual impairment and improving quality of life in this vulnerable pediatric population.

Our research team has previously completed preliminary investigations characterizing myopia in preschoolers. Building on this foundational work, we aim to construct a dedicated cohort of preschool children with refractive errors to delineate the natural history, progression risks and comorbidity profiles of preschool refractive error, and explore effective refractive correction and visual rehabilitation approaches for affected young children.

Studieoversigt

Status

Ikke rekrutterer endnu

Betingelser

Undersøgelsestype

Observationel

Tilmelding (Anslået)

1000

Kontakter og lokationer

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

Studiekontakt

Studiesteder

    • Guanzhou
      • Guangdong, Guanzhou, Kina, 510060
        • Zhongshan Ophthalmic Center Sun Yat-Sen 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

Tager imod sunde frivillige

Ingen

Prøveudtagningsmetode

Ikke-sandsynlighedsprøve

Studiebefolkning

This study enrolls preschool children aged 0-6 years with refractive errors as the observation group. Eligible subjects meet the following inclusion criteria: refractive error onset during preschool period confirmed by available medical records, spherical power ≤ -0.50 D or ≥ +3.00 D in any meridian, and written informed consent provided by legal guardians. Children who cannot cooperate with ophthalmic examinations and long-term follow-up will be excluded.

Beskrivelse

Inclusion Criteria:

  1. Onset of refractive error occurs during preschool age (0-6 years old) supported by retrievable medical records;
  2. Spherical equivalent power ≤ -0.50 D or ≥ +3.00 D in any meridian;
  3. Legal guardians agree to participate and sign written informed consent.

Exclusion Criteria:

Children unable to cooperate with examinations and follow-up visits.

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
Refractive error
Refractive error in preschool children

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
Ocular Biometry Parameters
Tidsramme: From date of enrollment until the date of loss to follow-up from any cause, whichever came first, assessed up to 36 months
A set of objective ocular structural measurements mainly including axial length (AL), alongside corneal curvature, anterior chamber depth, lens thickness and vitreous chamber depth. Axial length, the core indicator in this study, refers to the linear distance from the anterior corneal surface to the retinal pigment epithelium, which is closely associated with the onset and progression of refractive errors in preschool children. All biometric indices will be measured using standardized ophthalmic biometry equipment at each follow-up visit to dynamically observe the developmental rules of ocular dimensions and their correlation with refractive status.
From date of enrollment until the date of loss to follow-up from any cause, whichever came first, assessed up to 36 months

Sekundære resultatmål

Resultatmål
Foranstaltningsbeskrivelse
Tidsramme
BCVA
Tidsramme: From date of enrollment until the date of loss to follow-up from any cause, whichever came first, assessed up to 36 months
Visual Acuity Examination
From date of enrollment until the date of loss to follow-up from any cause, whichever came first, assessed up to 36 months
Contrast Sensitivity
Tidsramme: From date of enrollment until the date of loss to follow-up from any cause, whichever came first, assessed up to 36 months
CSF
From date of enrollment until the date of loss to follow-up from any cause, whichever came first, assessed up to 36 months
SER
Tidsramme: From date of enrollment until the date of loss to follow-up from any cause, whichever came first, assessed up to 36 months
Spherical Equivalent Refraction,Comprehensive index reflecting overall ocular refractive status, integrating myopia, hyperopia and astigmatism.
From date of enrollment until the date of loss to follow-up from any cause, whichever came first, assessed up to 36 months
WES (Whole Exome Sequencing)
Tidsramme: From date of enrollment until the date of loss to follow-up from any cause, whichever came first, assessed up to 36 months
Genetic sequencing results of all protein-coding regions to detect gene variants related to refractive disorders.
From date of enrollment until the date of loss to follow-up from any cause, whichever came first, assessed up to 36 months
OCT
Tidsramme: From date of enrollment until the date of loss to follow-up from any cause, whichever came first, assessed up to 36 months
OCT Imaging Findings
From date of enrollment until the date of loss to follow-up from any cause, whichever came first, assessed up to 36 months

Samarbejdspartnere og efterforskere

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

Sponsor

Samarbejdspartnere

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 (Anslået)

1. august 2026

Primær færdiggørelse (Anslået)

1. december 2026

Studieafslutning (Anslået)

1. december 2028

Datoer for studieregistrering

Først indsendt

9. juli 2026

Først indsendt, der opfyldte QC-kriterier

9. juli 2026

Først opslået (Faktiske)

15. juli 2026

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Faktiske)

15. juli 2026

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

9. juli 2026

Sidst verificeret

1. juli 2026

Mere information

Begreber relateret til denne undersøgelse

Yderligere relevante MeSH-vilkår

Andre undersøgelses-id-numre

  • 2023KYPJ340-2

Plan for individuelle deltagerdata (IPD)

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UBESLUTET

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