Towards Worldwide Comparability of Visual Acuity Assessment

• Conditions: Comparison of Visual Acuity Tests.; ETDRS. FrACT. Landolt Rings.

• Registration Number: NCT01312662
• Lead Sponsor: University Hospital Tuebingen

Brief Summary

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.

Detailed Description

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.

Study Timeline

• Status Verified: 2011-03
• Study Start: 2011-03
• Study First Submitted: 2011-03-08
• Study First Submitted QC: 2011-03-08
• Last Update Submitted: 2011-03-08
• Study First Posted: 2011-03-11
• Last Update Posted: 2011-03-11

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 84

Inclusion Criteria

Clinical diagnosis of:

• normal ophthalmological status,
• opacity of the refractive media,
• maculopathy,
• optic neuropathy
• chiasmal and postchiasmal visual pathway pathologies,
• amblyopia (deprivation),
• amblyopia (strabism)

Exclusion Criteria

• underage person
• concomitance of different eye-diseases

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Trial Locations

Locations (1)

Institute for Ophthalmic Research, University of Tuebingen; 🇩🇪 Tuebingen, Germany