The goal of this study is to develop an optimal method to detect the immune cells (cells that protect the human body against diseases) in association with abnormal conditions of the retina (light sensitive tissue in the back of the eye) that will be relevant to diseases such as age related macular degeneration (AMD), mild cognitive impairment (MCI) due to Alzheimer's Disease (AD) or mild AD. The main objectives of this study are: 1. Establish Optimal Method for Retinal Imaging of Dendritic Cells (DCs) 2. Safety and Tolerability of ICG infusion in normal healthy, older adult volunteers, in participants with AMD (Dry AMD with Geographic Atrophy (GA)), and in participants who have received a diagnosis of either Mild Cognitive Impairment (MCI) due to AD, or mild AD
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Determining Method to detect ICG immune cells both AMD and AD Patients
Timeframe: Retinal Scans are completed 30 minutes prior to start of ICG infusion (Baseline),240 and 360 minutes after start of ICG infusion. Each retinal scan takes 12-15 minutes.
Establish duration and dosage of ICG infusion
Timeframe: Retinal Scans are completed 30 minutes prior to start of ICG infusion (Baseline),240 and 360 minutes after start of ICG infusion. Each retinal scan takes 12-15 minutes.
Establish time intervals between ICG dosing and retinal imaging
Timeframe: Retinal Scans are completed 30 minutes prior to start of ICG infusion (Baseline),240 and 360 minutes after start of ICG infusion. Each retinal scan takes 12-15 minutes.
Verify locations of Dendritic Cells
Timeframe: Retinal Scans are completed 30 minutes prior to start of ICG infusion (Baseline),240 and 360 minutes after start of ICG infusion. Each retinal scan takes 12-15 minutes.
Safety data analyses will be conducted on all subjects who have started the infusion of ICG
Timeframe: Safety and Tolerability measures are assessed beginning from the signing of the ICF through the End of study (Telephone Follow-up Days 8-15).