Repeatability and Concordance of VA Measured With ETDRS Numeric , Landolt C, and Letter Charts in Thai Individuals
Launched by CHIANG MAI UNIVERSITY · Jun 20, 2016
Trial Information
Current as of July 24, 2025
Unknown status
Keywords
ClinConnect Summary
The ETDRS visual acuity chart has been used as a standard visual acuity measurement chart in ophthalmic clinical trials due to its proven high repeatability comparing to other visual acuity chart. However, the original ETDRS alphabet chart could not be used in every individual around the world, especially those who are non-english speakers. Landolt C chart has been a recommended chart to test visual acuity in those living in a country where English is not a common language, however, some difficulties including right-left confusion occurred when testing with the Landolt C chart, leading to t...
Gender
ALL
Eligibility criteria
- Inclusion Criteria:
- • Thai nationality
- • More than 18 years of age
- • Educational level: at least high school
- • Able to read English alphabet
About Chiang Mai University
Chiang Mai University, a prestigious institution in Thailand, is dedicated to advancing medical research and improving healthcare outcomes through innovative clinical trials. With a strong emphasis on ethical standards and scientific rigor, the university collaborates with local and international partners to explore novel therapies and interventions across various medical fields. Its commitment to education and research excellence fosters an environment where groundbreaking studies can thrive, ultimately contributing to the enhancement of patient care and the development of new medical knowledge.
Contacts
Jennifer Cobb
Immunology at National Institute of Allergy and Infectious Diseases (NIAID)
Locations
Muang Chiang Mai, Chiang Mai, Thailand
Patients applied
Timeline
First submit
Trial launched
Trial updated
Estimated completion
Not reported
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