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A Comparative Study of the W Symbol Chart, Lea Symbols Chart, and Standard Logarithmic Visual Acuity Chart in Visual Acuity Examination of Preschool Children

A Comparative Study of the W Symbol Chart, Lea Symbols Chart, and Standard Logarithmic Visual Acuity Chart in Visual Acuity Examination of Preschool Children

Status
Active, not recruiting
Phases
Unknown
Study type
Observational
Source
ChiCTR
Registry ID
ChiCTR2500114178
Enrollment
Unknown
Registered
2025-12-08
Start date
2025-12-13
Completion date
Unknown
Last updated
2025-12-15

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Refractive Error and Amblyopia

Interventions

Uncorrected Visual Acuity Group and Best-Corrected Visual Acuity Group:none

Sponsors

Eye Hospital, Wenzhou Medical University
Lead Sponsor

Eligibility

Sex/Gender
All
Age
4 Years to 6 Years

Inclusion criteria

Inclusion criteria: 1. Aged 4 to 6 years inclusive, and able to cooperate with visual acuity testing using the National Standard Logarithmic Visual Acuity Chart, the W Child Symbol Chart, and the Lea Symbols Chart; 2. All subjects were in good general health with normal intellectual development. They had no history of organic ocular diseases other than refractive errors, strabismus, or amblyopia, and had no prior participation in similar experiments; 3.Diopter range: Spherical power -3.00D to +3.00D, Astigmatism <= 1.00D, Anisometropia <= 1.50D.

Exclusion criteria

Exclusion criteria: 1.Individuals with cognitive or perceptual impairments that prevent them from cooperating with the examination.

Design outcomes

Primary

MeasureTime frame
visual acuity;—

Countries

China

Contacts

Public ContactWang Chenxiao

Eye Hospital, Wenzhou Medical University

175572077@qq.com+86 577 88075582

Outcome results

None listed

Source: ChiCTR (via WHO ICTRP) · Data processed: Feb 4, 2026