Objective Visual Acuity Measurement Using Suppression of the Optokinetic Nystagmus (OKN).
- Conditions
- Visual Acuity
- Interventions
- Diagnostic Test: Visual acuity testing with SW , Landolt-"C" and Tumbling-"E" symbols
- Registration Number
- NCT04642495
- Lead Sponsor
- University of Basel
- Brief Summary
Suppression of the optokinetic nystagmus when a target is perceived can be applied to assess visual acuity objectively. Our aim is to establish prediction intervals for this optokinetic nystagmus suppression test (Speedwheel Test, SW) so that SW acuity may be used to estimate Snellen acuity (FrACT- C and -E) in the clinic in adults and children unable to cooperate in other acuity testing.
- Detailed Description
In this prospective single center study subjects aged at least 4 years underwent testing of visual acuity with SW, Landolt-C and Tumbling-E symbols (Freiburg acuity test: FrACT-C, FrACT-E). Prediction intervals are to be established for SW compared to FrACT-C or -E and for FrACT- E compared to FrACT-C.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- 246
- able and willing to perform the test
- under 4 years of age
- unable or unwilling
Study & Design
- Study Type
- OBSERVATIONAL
- Study Design
- Not specified
- Arm && Interventions
Group Intervention Description Human subjects aged 4 and above Visual acuity testing with SW , Landolt-"C" and Tumbling-"E" symbols Human volunteers aged 4 and above.
- Primary Outcome Measures
Name Time Method Prediction intervals of Snellen acuity for the SW 12 months Prediction intervals of Snellen acuity for the SW compared to Landolt C and E symbols
- Secondary Outcome Measures
Name Time Method Prediction intervals of Snellen acuity for Landolt C compared to E symbols 12 months Prediction intervals of Snellen acuity for Landolt C compared to E symbols
Trial Locations
- Locations (1)
University Basel, University Eye Hospital Basel
🇨🇭Basel, Switzerland