Comparison of Four Methods for Entering the Gap Position of Landolt Cs

NCT04299659 | Completed

• 1 other identifier: LC Entry_2020
• Study Type: observational
• Target: 24
• Locations: 1 country
• Sites: 1

Brief Summary

The aim of this study is to investigate and compare the validity of four different input methods for Landolt Cs, i.e. the proportion of correct gap positions in relation to the total number of performances. The four input methods are a numeric keypad, an eight-positions rocker switch, a remote control and voice feedback.

Conditions

Quality Control; Validation Study

Keywords

psychophysics; visual acuity; response; response entry; validity; retest reliability; reproducibility; evaluation; optotype; Landolt C

Outcome Measures

Primary Outcomes (1)

• validity

  Proportion of correct gap position entries in relation to the total number of LC presentations by the four different entry methods

  Through study completion, an average of 3 months

Secondary Outcomes (3)

• retest reliability

  Through study completion, an average of 3 months

• Examination duration

  Through study completion, an average of 3 months

• Subjects´ satisfaction

  Through study completion, an average of 3 months

Interventions

Landolt C entry method DIAGNOSTIC_TEST

Four different methods for entering the Landolt C gap position are compared

Eligibility Criteria

• Age: 18 Years - 80 Years
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Adult (18-64), Older Adult (65+)
• Sampling Method: Non-Probability Sample

Study Population

Healthy, young subjects recruited for the students and or co-workers of the Aalen University of Applied Sciences

You may qualify if:

• Age: ≥ 18 years
• Informed consent
• (Distance) visual acuity with best correction: ≥ 0.8
• (Distant) ametropia: ≤+8.0 Diopters (spherical equivalent)
• Anisometropia ≤ 3 dpt
• Astigmatism ≤ 2.5 dpt

You may not qualify if:

• Prolonged reaction time caused by drugs (medications)/ drugs/alcohol
• Movement disorders (of hands) such as Parkinson's disease
• Indication of amblyopia (strabismus surgery, occlusion therapy etc.)
• Eye movement disorders/double vision
• Defective stereo vision (according to LANG \[I\] stereo test)
• Presence of a relative afferent pupil defect ("swinging flashlight test)
• Any hint of visual pathway lesion or other chronic or progressive eye disease

Sponsors & Collaborators

• Aalen University: lead

Study Sites (1)

Ulrich SCHIEFER

Aalen, Deutschland, 73430, Germany

Location

Study Officials

• Ulrich Schiefer, M.D.

  +49 7361 576-4605

  STUDY CHAIR

Study Design

• Study Type: observational
• Observational Model: COHORT
• Time Perspective: PROSPECTIVE
• Sponsor Type: OTHER
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: March 1, 2020
• First Posted: March 9, 2020
• Study Start: July 22, 2022
• Primary Completion: March 1, 2023
• Study Completion: June 30, 2023
• Last Updated: July 20, 2023

Record last verified: 2023-07

Data Sharing

• IPD Sharing: Will not share

Locations

DE (1)