Towards Worldwide Comparability of Visual Acuity Assessment

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

Status

UNKNOWN

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT01312662

Acronym

VisComp

Enrollment

Registered

2011-03-11

Start date

2011-03-31

Completion date

Unknown

Last updated

2011-03-11

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Comparison of Visual Acuity Tests., ETDRS. FrACT. Landolt Rings.

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.

Interventions

None listed

Study design

Observational model

CASE_CONTROL

Time perspective

PROSPECTIVE

Eligibility

Sex/Gender

ALL

Age

18 Years to No maximum

Healthy volunteers

Yes

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

Countries

Germany

Contacts

Primary ContactFelix Tonagel, MD

ResearchGroupVisualPathway@googlemail.com

Outcome results