Age-Related Macular Degeneration, Scotopic Dysfunction, and Driving Performance in a Simulator

Age-related Macular Degeneration Clinical Trial

Official title:

Age-Related Macular Degeneration, Scotopic Dysfunction, and Driving Performance in a Simulator

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03166202
• Other study ID #: 228382017
• Status: Completed
• Start date: September 1, 2018
• Est. completion date: March 5, 2019

Study information

• Verified date: June 2019
• Source: University of Alabama at Birmingham
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

Previous work collectively suggests that rod-mediated dark adaptation (RMDA) is a promising candidate as a functional endpoint measure for evaluating interventions to slow early progression of age-related macular degeneration (AMD). However, there is no agreement among the clinical, research and regulatory communities as to what constitutes a clinically (practically) significant slowing in RMDA. Treatments for AMD are often not considered efficacious if they do not result in a criterion level of improvement in vision. But how much change in the rate of dark adaptation constitutes a clinically significant change? Until this issue is resolved, progress in developing clinical trials on early AMD are at a standstill since there is no functional endpoint to be used in the trial. One approach to establishing clinical significance is to examine how RMDA relates to the performance of an everyday visual task under low luminance conditions, such as night driving or reading. However, such data are not yet available. The purpose of this project is to examine the relationship between RMDA and night-time driving and reading under poor illumination. This information will guide the development of a definition of a clinically significant difference in RMDA that can be used in designing clinical trials on early AMD.

Description:

The specific aims of this study are as follows:

Aim 1: To examine the association between RMDA as assessed by the rod intercept time and self reported driving difficulty and experiences during night time driving.

Aim 2: To examine the association between RMDA as assessed by rod intercept time and reading performance as assessed by the MNREAD test administered under a low light level. Reading performance will be defined in terms of maximum reading speed, critical print size (i.e., the smallest print size that supports maximum reading speed), reading acuity (i.e., the smallest print size that can be just read) and the reading accessibility index (i.e., an individual's access to text over the range of print sizes found in everyday life).

Recruitment information / eligibility

• Status: Completed
• Enrollment: 40
• Est. completion date: March 5, 2019
• Est. primary completion date: March 5, 2019
• Accepts healthy volunteers: No
• Gender: All
• Age group: 60 Years to 95 Years

Eligibility

Inclusion Criteria:

• age-related macular degeneration in one or both eyes, ability to follow simple instructions, licensed to drive a vehicle, can read and speak English

Exclusion Criteria:

• diabetes, retinal or optic nerve conditions other than age-related macular degeneration, neurological conditions that impair vision

Related Conditions & MeSH terms

• Age-related Macular Degeneration
• Macular Degeneration

Locations

Country	Name	City	State
United States	Callahan Eye Hospital, UAB Dept of Ophthalmolog & Visual Sciences	Birmingham	Alabama

Sponsors (1)

Lead Sponsor	Collaborator
University of Alabama at Birmingham

Country where clinical trial is conducted

United States, 

References & Publications (1)

Owsley C, McGwin G Jr, Clark ME, Jackson GR, Callahan MA, Kline LB, Witherspoon CD, Curcio CA. Delayed Rod-Mediated Dark Adaptation Is a Functional Biomarker for Incident Early Age-Related Macular Degeneration. Ophthalmology. 2016 Feb;123(2):344-51. doi: 10.1016/j.ophtha.2015.09.041. Epub 2015 Oct 30. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	rod intercept time	rate of rod-mediated dark adaptation	measured once (1 day)
Secondary	severity of age-related macular degeneration	defined by grading of color fundus photos	measured once (1 day)