AMD and Validation Rod-Meditated Dark Adaptation With Everyday Task Performance

Overview

The goal is to conduct a cross-sectional, single timepoint study on older adults with early and intermediate AMD, and with subretinal drusenoid deposits (SDD), and those in normal health, establishing an association between dark adaptation and reading performance under dim illumination, both which depend on rod photoreceptors.

The investigators propose two sites for the study, Duke University and UAB. Each site will enroll 100 participants as indicated in the table above, per the AREDS 9-step AMD classification system, with 200 participants in the sample. Because the variance of rod-mediated dark adaptation in AMD patients increases with increasing disease severity, the investigators will implement a larger sample size for intermediate AMD and a smaller sample for patients in normal macular health. The investigators will collect demographic characteristics (age, race/ethnicity, gender), ocular medical history from the electronic health record, and medication use. In addition, the protocol will focus on measuring the following major components: 1. Comprehensive eye exam 2. Rod-mediated dark adaptation 3. Reading performance 4. Mobility 5. Ellipsoid zone loss and attenuation Statistical associations will be computed using correlational analysis for the overall sample, within each patient group, and also separately for those with SDD. Sample size estimation is challenging because there is no previous literature on the association between rod-mediated dark adaptation and MNREAD reading performance or MOST performance. With a sample size of 200 participants, the investigators will have adequate statistical power (80%) to detect a correlation of at least 0.20 for the total sample and adequate statistical power to detect within-group correlations of at least 0.40.

Conditions

Interventions

Eligibility

Locations (1)

Outcomes

Central Contacts