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OpenTrials
Completed

NCT Number: NCT04642495

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

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.

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Key information

Conditions

Visual Acuity

Age range

4 year and older

Sex eligibility

All sexes

Study type

Observational

Primary location

University Basel, University Eye Hospital Basel

Basel, 4031, Switzerland

About this study

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.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • able and willing to perform the test

Exclusion criteria

  • under 4 years of age
  • unable or unwilling

Treatment and study plan

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

Diagnostic Test

Establish prediction intervals for acuity tests

Primary outcomes

  1. Prediction intervals of Snellen acuity for the SW

    Time frame: 12 months

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

Secondary outcomes

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

    Time frame: 12 months

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

Sponsors and collaborators

Lead sponsor

University of Basel

Other

Registry information

Official study title

Clinical Application of Objective Visual Acuity Measurement Using Suppression Method to Inhibit Optokinetic Nystagmus (OKN).

Acronym: Speedwheel

Important dates

Study start
2019
Primary completion
2020
Study completion
2020
First posted
Nov 24, 2020
Registry last updated
May 10, 2021

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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