Comparison of Visual Acuity Tests. Clinical Trial
Official title:
Towards Worldwide Comparability of Visual Acuity Assessment A Pilot Study Comparing ETDRS Visual Acuity Charts, Projected Landolt Charts and the Freiburg Visual Acuity Test (FrACT) With a View to Developing a Mathematical Transformation Routine Between the Results From These Three Tests
Purpose of this study is to investigate the agreement, the test-retest reliability of three established and widely used visual acuity tests, to develop a mathematical transformation routine between the results from these three tests, to assess the examinees´ and examiners´ acceptance and to compare the test durations.
Assessment of distant visual acuity is the most frequently used procedure for estimation of
visual performance. However, there exist a vast number of markedly differing visual acuity
tests worldwide; furthermore there are differing report formats to express acuity. This
variety may critically interfere with standardization and comparability of this basic visual
test method.
Purpose of this study is to investigate the agreement, the test-retest reliability of three
established and widely used visual acuity tests, i.e., the Early Treatment Diabetic
Retinopathy Study (ETDRS) visual acuity charts, a conventional projected distant visual
acuity test according to DIN 58220 part 3, and the Freiburg visual acuity test (FrACT), to
develop a mathematical transformation routine between the results from these three tests, to
assess the examinees´ and examiners´ acceptance and to compare the test durations.
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Observational Model: Case Control, Time Perspective: Prospective