MedTrace Logo

Comparison of the Freiburg Visual Acuity Test (FrACT) With the EDTRS- and Landoltring Charts

NCT02198534 · Status: COMPLETED · Type: OBSERVATIONAL · Enrollment: 25

Last updated 2016-11-23

No results posted yet for this study

Summary

A) For the investigation of Visual acuity, inter-test agreement and the test-retest reliability were used three different visual acuity tests: ETDRS charts, Landoltring chart and Freiburg Visual Acuity Test (FrACt). The examinees passed each visual acuity test twice but the sequence of the visual acuity tests were randomize and so different for each examinee. The examinees were 24 adult Aalen university students (except students of ophthalmic optics in terms 2 - 7) with a minimal distant visual acuity without or with correction of 0.2. Another inclusion criteria was a maximum myopia of sph -2,00 dpt, a maximum hyperopia of sph +5,50 dpt and a maximum astigmatism of cyl 2,50 dpt. The Landolt C was projected in eight-orientations. For the FrACT Test we used two different devices for response input: a modified keypad with Landoltring symbols (FrACTk) and a haptic Landolt device with an adjustable Landoltring (FrACTh). The primary objective was the comparison between FrACTk and FrACTh. The secondary Objective contains the comparison between all visual acuity tests.

B) Background: Landolt Cs and letters are commonly used optotypes. In the explorative study we compare four different ways of applying them: The Freiburg visual acuity test (FrACT) using a keypad and a haptic Landolt device, a Landolt C chart in accordance to ISO 8596 and DIN 58220 with eight-orientated Landolt C and ETDRS charts. The aims of the survey were to determine examinee´s/examiner´s subjective ratings using Visual analogue scales (VAS), the inter-test agreement between the tests and test-retest reliability of the tests, concerning the test duration.

Subjects and Methods: Twenty-four adult examinees with a visual acuity of ≥ 0,2 were included in the explorative study. The visual acuity of one eye was measured monocularly, randomized with regard to the leading/non-leading eye. The subjects passed every visual acuity test twice in a randomized sequence of the visual acuity tests, which is maintained by a pre-specified randomization list, making use of forced choice.

Conditions

  • Ophthalmologically Normal Subjects

Interventions

DEVICE

Methodology of visual acuity assessment

Sponsors & Collaborators

  • Schiefer Ulrich

    lead OTHER

Principal Investigators

  • Ulrich Schiefer, Prof. Dr. med. · University of Applied Sciences Aalen

Eligibility

Min Age
18 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2014-06-30
Primary Completion
2014-10-31
Completion
2015-06-30

Countries

  • Germany

Study Locations

More Related Trials

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT02198534 on ClinicalTrials.gov