Objective Visual Acuity Measurement Using Suppression of the Optokinetic Nystagmus (OKN). (Speedwheel)

University of Basel

Status: Completed

Conditions: Visual Acuity

Treatments: Diagnostic Test: Visual acuity testing with SW , Landolt-"C" and Tumbling-"E" symbols

Study type: Observational

Funder types: Other

Identifiers

NCT04642495

2016-02078

Details and patient eligibility

About

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.

Full 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.

Enrollment: 246 patients

Sex: All

Ages: 4+ years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• able and willing to perform the test

Exclusion criteria

• under 4 years of age
• unable or unwilling

Trial design

246 participants in 1 patient group

Human subjects aged 4 and above

Description:

Human volunteers aged 4 and above.

Treatment:

Diagnostic Test: Visual acuity testing with SW , Landolt-"C" and Tumbling-"E" symbols