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A New Parameter for the Assessment of Distance Visual Capacity: the Critical Visual Acuity (CVA)
Sponsor: Democritus University of Thrace
Summary
The conventional examination of the visual acuity (VA) does not take into account the patient's reading speed. However, the consideration of the speed for the recognition of the VA charts' symbols leads to the more accurate and comprehensive assessment of the visual capacity. Therefore, primary objective of this study is to develop and validate a new parameter for the more comprehensive evaluation of visual capacity: the critical visual acuity (CVA). CVA takes into account the speed of recognition of the symbols of the distance visual charts.
Official title: Development and Validation of a New Parameter for the Assessment of Distance Visual Capacity: the Critical Visual Acuity (CVA)
Key Details
Gender
All
Age Range
18 Years - 75 Years
Study Type
OBSERVATIONAL
Enrollment
300
Start Date
2020-09-20
Completion Date
2025-12-20
Last Updated
2025-07-11
Healthy Volunteers
Yes
Conditions
Interventions
VA assessment
The VA of all participants will be evaluated by counting the smallest line that can be read within a time duration greater than or equal to the average reading time of the larger lines minus 2.58 times the SD of the reading time of these lines. In clinical practice, the VA is the common parameter of VA adding a tolerant time limit to clearly determine the end of the test.
CVA assessment
The CVA of all participants will be evaluated by counting the smallest line that can be read within a time duration greater than or equal to the average reading time of the larger lines minus 1.96 times the SD of the reading time of these lines. In clinical practice, the CVA is the minimum VA that can be read in maximal speed.
Locations (1)
Department of Ophthalmology, University Hospital of Alexandroupolis
Alexandroupoli, Evros, Greece