Wenzhou Dry Age-related Macular Degeneration (AMD) Progression Study
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|ClinicalTrials.gov Identifier: NCT03433885|
Recruitment Status : Recruiting
First Posted : February 15, 2018
Last Update Posted : July 18, 2019
|Condition or disease|
|Macular Pigment Optical Density|
Age-related macular degeneration (AMD) is the leading cause of blindness in the elderly. The disease is categorized into early, intermediate, or advanced stages based on the severity of symptoms. The advanced stage, including GA and CNV, involves central region of the retina, which leads to a gradual or rapid loss of photoreceptors and central vision.
The macular pigment (MP) consists of xanthophyll, which is formed from the yellow carotenoid lutein, zeaxanthin, and meso-zeaxanthin.These pigments play an important role in protecting the retina against oxidative stress through different mechanisms. Many studies have shown a various association of AMD and MP.Blue Mountain Eye Study revealed low dietary intake of lutein and zeaxanthin is associated with a higher risk of AMD. However, dry and wet subtypes of AMD may have different etiologies and risk factors. Little is known whether longitudinal study of macular pigment optical density (MPOD) is related to AMD progression.
A comprehensive ophthalmologic examination including fundus photography,OCT and MPOD was performed at baseline, and semiannually thereafter for 3 years. Fundus reflectance (VISUCAM 500, reflectance of a single 460 nm wavelength) was used to measure the MPOD levels. Associated risk factors including body-mass index (BMI), smoking, diet, and cardiovascular diseases were documented. Drusen characteristics (size, type, area), pigmentary abnormalities (increased pigment, depigmentation, geographic atrophy), and presence of abnormalities characteristic of neovascular AMD were graded. For estimations of AMD progression , a 9-step severity scale that combines a 6-step drusen area scale with a 5-step pigmentary abnormality scale is used.
In this study, we are going to investigate a 3-year study of incidence and progression for AMD and associated risk factors, in a population-based cohort of Chinese aged 45 years and older living in the city of Wenzhou.
|Study Type :||Observational|
|Estimated Enrollment :||300 participants|
|Official Title:||Progression of Dry Age-related Macular Degeneration (AMD): Association With Macular Pigment Optical Density (MPOD)|
|Actual Study Start Date :||January 1, 2018|
|Estimated Primary Completion Date :||December 31, 2020|
|Estimated Study Completion Date :||December 31, 2023|
Progressors are those individuals with early or intermediate AMD at baseline who progress to advanced AMD during follow-up, and individuals with advanced AMD in one eye at baseline who progress to advanced AMD in both eyes.
Nonprogressors are those individuals with early or intermediate AMD at baseline who do not progressed to advanced AMD during follow-up, and individuals with advanced AMD in one eye at baseline who do not progress to advanced AMD in fellow eye.
- Association between changes of macular pigment optical density (MPOD) level and incidence rates of advanced AMD [ Time Frame: from baseline to month 36 ]Incident advanced AMD was evaluated based on the AMD grade at the end of the clinical trial with follow-up time of 3 years. Progressors were those individuals with early or intermediate AMD at baseline who progressed to advanced AMD during follow-up, and individuals with advanced AMD in one eye at baseline who progressed to advanced AMD in both eyes
- Association between age and incident Advanced AMD [ Time Frame: baseline ]controlling for age (70 years or older versus younger than 70)
- Association between gender and incident Advanced AMD [ Time Frame: baseline ]
- Association between Baseline AMD grade and incident Advanced AMD [ Time Frame: baseline ]Baseline AMD grade was deﬁned as AREDS category 1 in both eyes (essentially free of age-related macular abnormalities), category 2 in the worst eye (mild changes including multiple small drusen, nonextensive intermediate drusen, and/or pigment abnormalities), category 3 in the worst eye (at least one large drusen of at least 125µm diameter, extensive intermediate drusen, and/or noncentral geographic atrophy), category 4 in one eye (advanced AMD, either neovascular or central geographic atrophy, or visual loss due to AMD regardless of phenotype), or category 4 in both eyes.
- Association between cigarette smoking and incident Advanced AMD [ Time Frame: baseline ]
cigarette smoking information was acquired by questionaires(never, past, or current)
- Association between body mass index (BMI) and incident Advanced AMD [ Time Frame: baseline ]BMI was calculated as the weight in kilograms divided by the square of the height in meters ( 25, 25-29.9, and 30 )
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT03433885
|Contact: Rong Zhou, MDemail@example.com|
|The eye hospital of Wenzhou Medical University||Recruiting|
|Wenzhou, Zhejiang, China, 325000|
|Contact: Rong Zhou, MD|
|Principal Investigator: Xiaoling Liu, MD|
|Principal Investigator:||Xiaoling Liu, MD||The Eye Hospital of Wenzhou Medical University|