Usability of the Software MacuFix for the Categorization of Metamorphopsia

Vision Disorders Clinical Trial

— MacuFix  

Official title:

Usability of the Software MacuFix for the Categorization of Metamorphopsia and Evaluation of Patient Adherence Compared to the Amsler Grid

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT04347564
• Other study ID #: metacat
• Status: Completed
• Start date: May 4, 2020
• Est. completion date: September 30, 2020

Study information

• Verified date: May 2021
• Source: Augenheilkunde Lindenthal
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

The usability of a novel test to categorize a distorted visual impression (metamorphopsia) is examined with the questionnaire "SUS"

Description:

Introduction Diseases of the retinal centre (macula) can lead to a distorted visual impression (metamorphopsia). The usability of a novel on-screen test to categorize metamorphopsia is to be examined with the questionnaire "SUS" to determine how user-friendly the software is perceived.

Purpose To examine the usability of the software for persons perceiving metamorphopsia employing the questionnaire SUS.

Aim of the work Improvement of the software in terms of user-friendliness.

Methods For this observational pilot study, 30 persons are to be recruited from the patient pool of a private practice.

Primary endpoint: Score of the SUS questionnaire.

Each participating person performs the test once with each eye wearing appropriate near correction. The test shows on a screen 4 square fields with a grid pattern of horizontal and vertical lines. All 4 fields have lines that are partially distorted. The task of the test person is to select the field with more distinctively distorted lines when viewed with one eye.This selection must be made at least 10 times per eye: an algorithm determines the smallest correctly named distortion difference. Afterwards each person answers the System Usability Scale (SUS) questionnaire, SUS contains five positive and five negative statements on the usability of the system being evaluated. For each statement, the study participant gives his or her approval or rejection in the form of a scale ranging from 1= "strong approval" to 5= "strong rejection" of the statement. The results of the SUS questionnaire are used to calculate a numerical value (SUS score).

Recruitment information / eligibility

• Status: Completed
• Enrollment: 45
• Est. completion date: September 30, 2020
• Est. primary completion date: September 30, 2020
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

1. Distorted visual impression in at least one eye, detected with Amsler grid:

2. Best-corrected visual acuity (BCVA): at least 20/200; age over 18 years; presence of a declaration of consent to participate in the study

Exclusion Criteria:

No distorted visual impression in both eyes; best corrected visual acuity under 0.1; age under 18 years

Related Conditions & MeSH terms

• Vision Disorders

Locations

Country	Name	City	State
Germany	Augenheilkunde Lindenthal	Cologne

Sponsors (1)

Lead Sponsor	Collaborator
Augenheilkunde Lindenthal

Country where clinical trial is conducted

Germany, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Score of System Usability Scale (SUS) Questionnaire	Patients filled out the SUS questionnaire immediately after completing the MacuFix test. SUS consists of ten statements each with five possible answers ranging from complete rejection to complete agreement. For each statement, the participant gives his or her approval or rejection in the form of a scale ranging from 1=strong approval to 5=strong rejection. The results of the SUS questionnaire are used to calculate a numerical value (SUS score).The results can have a value between 0 (worst application imaginable) and 100 (best application imaginable)	1 day
Secondary	Median Time Interval (in Days) Between Two Self-test Measurements (MakuFix or Amsler Respectively) to Assess the Test Adherence	After a positive vote by the Ethics Committee of the North Rhine Medical Association (No. 2020057) 45 patients were included in the study from 4th May, 2020 - 30th June, 2020. Based on the amendment approval of the competent ethics committee (No. 600213225) participating persons were offered to use the App MacuFix® as a home test and to start a prospective, controlled study to examine the adherence using a self-test and evaluate the vison-related quality of life.; On the study day and 3 months later each patient was asked about the frequency of use of the Amsler test.; The time interval given by the patient between two Amsler Tests (Amsler group) or two MacuFix texts (MacuFix group) was assessed in days.	On the study day and 3 months after the study day, patients were asked how many days usually elapsed after a test with the method they chose until the next time they used this test method.
Secondary	Change of Vision-related Quality of Life (NEI VFQ-25, Subscale 7) After Use of the App MacuFix Versus Amsler Grid/no Test	The validated questionnaire "National Eye Institute Visual Function Questionnaire-25" (NEI VFQ-25) was used to measure vision-related quality of life. The values in the questionnaire can take values from 0 to 100. High values in this questionnaire correspond to a better quality of life, low values to a poor quality of life. The 25 questions of this questionnaire can be assigned to 12 scales.	The validated questionnaire "National Eye Institute Visual Function Questionnaire-25" (NEI VFQ-25) was used at baseline and after 3 months.