{"type":"trials","record":{"id":41371,"source_id":"clinicaltrials-gov","external_id":"NCT03225131","title":"Dark Adaptation in Participants With Age-Related Macular Degeneration","brief_summary":"Background: Macular degeneration can cause permanent loss of central vision. This vision is important for seeing details. Age-related macular degeneration (AMD) is the leading cause of vision loss in people over 55 in the United States. Researchers want to follow people with AMD to study the early to middle stages of the disease. Objective: To follow for another 5 years participants who completed NIH study 11-EI-0147. Eligibility: Participant was enrolled in and completed study 11-EI-0147. Design: Participants will have at least 6 study visits over 5 years. Each visit takes about 5 hours. At visit 1, participants will be asked about their medical and eye disease history. They will have an eye exam. The exam will test vision, eye pressure, and eye movements. The pupil will be dilated with eye drops. Participants will have baseline exams. These include a health history and questions about problems that affect their eyes under different lighting. They will answer these questions each year. At each visit, participants will have some or all of these tests: Eye exam Dark adaptation protocol. This measures how fast the eyes recover when exposed to decreasing levels of light. The pupil will be dilated with eye drops. Participants will sit in front of a metal box with a camera inside. They will push a button when they see a light in the machine. View a bright background light for 5 minutes. After the light is turned off participants will push a button when a blue or red light is seen. Sit in the dark for about 30 minutes. Participants will push a button when they see a blue or red light.","overall_status":"Completed","phases":[],"study_type":"OBSERVATIONAL","sponsor":"National Eye Institute (NEI)","enrollment":57,"countries":["United States"],"start_date":"2017-06-16","completion_date":"2025-08-15","last_update_date":"2026-09-08","source_url":"https://clinicaltrials.gov/study/NCT03225131","editorial_summary":"A registered study indexed because it matched monitored longevity research terms. Registry status: Completed. Registration does not establish safety or effectiveness.","first_seen_at":"2026-09-25T01:25:30.378222+00:00","last_seen_at":"2026-09-25T06:20:47.789+00:00","metadata":{"sex":"ALL","acronym":null,"age_range":"50 Years to 100 Years","comparator":null,"organization":"National Institutes of Health Clinical Center (CC)","interventions":[],"registry_source":"ClinicalTrials.gov","outcome_measures":["The primary objective will be to determine mean change, including distribution of change in dark adaptation response be…","Mean change in dark adaptation and other characteristic parameters of the dark adaptation response from baseline at mon…"],"design_description":null,"source_has_results":false},"controlled_terms":["Age-Related Macular Degeneration"],"relevance_confidence":100,"source_quality_score":100,"freshness_score":100,"publication_state":"published","match_explanation":"Title contains controlled term: age-related macular degeneration.","quality_checked_at":"2026-09-25T06:20:59.355028+00:00","duplicate_cluster_key":"id:nct03225131","duplicate_of_id":null,"evidence_snapshot":{"status":"structured","version":1,"duration":"2017-06-16 to 2025-08-15","comparator":null,"confidence":"structured-source","population":"ALL · 50 Years to 100 Years","provenance":{"duration":"start_date and completion_date","comparator":"registry arm fields","population":"registry eligibility fields","intervention":"registry intervention fields","participants":"enrollment","study_design":"study_type and registry design fields","evidence_stage":"phases","reported_outcome":"not available","outcomes_measured":"registry outcome-measure fields"},"generated_at":"2026-09-25T06:20:47.800Z","intervention":[],"participants":57,"study_design":"OBSERVATIONAL","subject_scope":"Human clinical study registration","evidence_stage":"Phase not reported","safety_context":"Eligibility, adverse-event details, and clinical decisions must be checked in the official registry and with qualified clinicians.","source_support":"Structured registry protocol metadata; no finding-level conclusion is generated.","main_limitation":"This is a study registration. No reusable structured result is available here, so it cannot show whether the intervention worked or was safe.","reported_outcome":null,"outcomes_measured":["The primary objective will be to determine mean change, including distribution of change in dark adaptation response be…","Mean change in dark adaptation and other characteristic parameters of the dark adaptation response from baseline at mon…"],"regulatory_context":"Trial registration is not regulatory approval and does not establish that an intervention is available."},"clinical_trial_topics":[{"topic_slug":"vision-aging","is_published":true,"match_reasons":["Title contains controlled term: age-related macular degeneration.","Abstract contains controlled term: age-related macular degeneration.","Source terminology contains: age-related macular degeneration.","Title supplies longevity context: age-related.","Study type is explicitly identified as OBSERVATIONAL."],"matched_fields":["title","abstract","controlled terminology","title context","study type"],"relevance_score":100,"intelligence_topics":{"name":"Vision ageing","slug":"vision-aging"}}],"content_sources":{"name":"ClinicalTrials.gov","homepage_url":"https://clinicaltrials.gov/"}},"canonical_url":"https://www.immortal.life/trials/41371","automation_disclosure":"Generated automatically from cited source metadata. No scientist, clinician, researcher, editor, or human reviewer evaluates this publication before release."}