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

University of Basel246 enrolled

Overview

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.

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.

Study Type

OBSERVATIONAL

Enrollment

246

Conditions

Visual Acuity

Interventions

Visual acuity testing with SW , Landolt-"C" and Tumbling-"E" symbolsDIAGNOSTIC_TEST

Establish prediction intervals for acuity tests

Eligibility

Sex: ALLMin age: 4 YearsHealthy volunteers:

Medical Language ↔ Plain English

Inclusion Criteria: * able and willing to perform the test Exclusion Criteria: * under 4 years of age * unable or unwilling

Locations (1)

University Basel, University Eye Hospital Basel

Basel, Switzerland

Outcomes

Primary Outcomes

Prediction intervals of Snellen acuity for the SW

Prediction intervals of Snellen acuity for the SW compared to Landolt C and E symbols

Time frame: 12 months

Secondary Outcomes

Prediction intervals of Snellen acuity for Landolt C compared to E symbols

Time frame: 12 months

Data from ClinicalTrials.gov

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