Repeatability and Concordance of VA Measured With ETDRS Numeric , Landolt C, and Letter Charts in Thai Individuals
NCT ID: NCT02810665
Last Updated: 2016-06-23
Study Results
The study team has not published outcome measurements, participant flow, or safety data for this trial yet. Check back later for updates.
Basic Information
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UNKNOWN
180 participants
OBSERVATIONAL
2015-07-31
2016-07-31
Brief Summary
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Detailed Description
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Therefore, this study aims to determine the repeatability and concordance of visual acuity level measured with the original ETDRS alphabet, the ETDRS Landolt C, and the ETDRS numeric chart. Results from this study would be able to suggest an appropriate ETDRS chart to be used in clinical studies in Thailand or other countries where English is not the native language.
Conditions
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Study Design
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CASE_ONLY
CROSS_SECTIONAL
Study Groups
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Normal vision group
Individuals with VA 20/20 to 20/25
Visual acuity measurement by ETDRS chart
All participants must complete VA measurement of the study eye using 3 charts including the original ETDRS alphabet, ETDRS Landolt C, and ETDRS numeric charts for 2 times, at least 30 minutes apart.
Impaired vision group
Individuals with impaired vision: VA of 20/32 to 20/200 due to either cataract, diabetic macular edema, or age-related macular degeneration
Visual acuity measurement by ETDRS chart
All participants must complete VA measurement of the study eye using 3 charts including the original ETDRS alphabet, ETDRS Landolt C, and ETDRS numeric charts for 2 times, at least 30 minutes apart.
Interventions
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Visual acuity measurement by ETDRS chart
All participants must complete VA measurement of the study eye using 3 charts including the original ETDRS alphabet, ETDRS Landolt C, and ETDRS numeric charts for 2 times, at least 30 minutes apart.
Eligibility Criteria
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Inclusion Criteria
* More than 18 years of age
* Educational level: at least high school
* Able to read English alphabet
18 Years
ALL
Yes
Sponsors
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Chiang Mai University
OTHER
Responsible Party
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Voraporn Chaikitmongkol
Instructor
Locations
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Voraporn Chaikitmongkol
Muang Chiang Mai, Chiang Mai, Thailand
Countries
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Central Contacts
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Facility Contacts
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References
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Ricci F, Cedrone C, Cerulli L. Standardized measurement of visual acuity. Ophthalmic Epidemiol. 1998 Mar;5(1):41-53. doi: 10.1076/opep.5.1.41.1499.
Ferris FL 3rd, Kassoff A, Bresnick GH, Bailey I. New visual acuity charts for clinical research. Am J Ophthalmol. 1982 Jul;94(1):91-6.
Kaiser PK. Prospective evaluation of visual acuity assessment: a comparison of snellen versus ETDRS charts in clinical practice (An AOS Thesis). Trans Am Ophthalmol Soc. 2009 Dec;107:311-24.
Ruamviboonsuk P, Tiensuwan M, Kunawut C, Masayaanon P. Repeatability of an automated Landolt C test, compared with the early treatment of diabetic retinopathy study (ETDRS) chart testing. Am J Ophthalmol. 2003 Oct;136(4):662-9. doi: 10.1016/s0002-9394(03)00394-5.
Other Identifiers
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OPT-2558-03133
Identifier Type: -
Identifier Source: org_study_id
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