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Investigating Age-Related Macular Degeneration

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00342251
Recruitment Status : Completed
First Posted : June 21, 2006
Last Update Posted : July 2, 2017
Information provided by:
National Institutes of Health Clinical Center (CC)

Brief Summary:

Age-related macular degeneration (ARMD) affects older Americans and can lead to irreversible blindness. Although the cause if ARMD is unclear, it appears to be a condition that is affected by both genetic and environmental influences.

The purpose of this study is to examine an Amish community to investigate genetic factors in the development of ARMD.

Study participants will be 1,000 members, ages 50 and older, of the Old Order Amish community in Lancaster and Franklin counties in Pennsylvania. Each will undergo a 30-minute dilated eye exam during which an ophthalmologist or optometrist will take digital images of the macula and optic disc. Depending on the results of their eye exam, participants may be asked to give a blood sample as well. They will also complete a brief questionnaire about personal exposure related to occupation, sunlight and smoking.

Condition or disease
Age-Related Macular Degeneration

Detailed Description:
Age-related macular degeneration (AMD) is a leading cause of visual impairment in the United States. Available evidence suggests that AMD is a complex disorder with a significant genetic component as well as potential environmental influences. In this study we propose to examine 3,000 members, ages 50 and older, of the Old Order Amish community in the Lancaster and Franklin counties area in Pennsylvania. We plan to detail the epidemiology of AMD in this population isolate in attempt to elucidate genetic factors which may confer susceptibility and predispose some Amish individuals and their families to develop AMD. All study participants agreeing to enroll and providing informed consent will undergo a complete, dilated eye examination during which digital stereo images of the macula and optic disc regions will be acquired. Study participants will also be asked to complete a brief questionnaire inquiring about personal exposures related to occupation, sunlight, and smoking. AMD will be determined by an independent reading of the digital fundus photographs by the University of Wisconsin Fundus Photography Reading Center according to the AREDS AMD classification scheme. We will employ standard statistical genetics methods of parametric and non-parametric linkage analysis, association analysis, and transmission disequilibrium tests, with allowances for environmental (i.e. non-genetic) factors to determine if we can identify any candidate regions or candidate genes that predispose Amish individuals to an increased risk of AMD. Ultimately, we hope to follow up any regions that show suggestive evidence of linkage on the genome-wide scan with fine mapping in those regions, leading to eventual cloning and sequencing of a gene or genes.

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Study Type : Observational
Estimated Enrollment : 3000 participants
Time Perspective: Prospective
Official Title: Age-Related Macular Degeneration: A Genetic Epidemiology Study in the Amish
Study Start Date : June 20, 2003
Study Completion Date : April 4, 2012

Resource links provided by the National Library of Medicine

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   50 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

All Amish individuals, ages 50 and older, who either respond in the affirmative to the letter of invitation or are self-referred to the Amish clinic for participation in the AMD study, will be eligible.


Individuals who decline participation, who are unwilling to sign the Consent Form, and who are not recognized by the Amish as being Amish will be excluded.

There are no clinical inclusion/exclusion criteria.

Information from the National Library of Medicine

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 identifier (NCT number): NCT00342251

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United States, Pennsylvania
University of Pennsylvania
Philadelphia, Pennsylvania, United States, 19104-6056
Sponsors and Collaborators
National Eye Institute (NEI)
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Principal Investigator: Susan Vitale, Ph.D. National Eye Institute (NEI)
Layout table for additonal information Identifier: NCT00342251    
Other Study ID Numbers: 999903235
First Posted: June 21, 2006    Key Record Dates
Last Update Posted: July 2, 2017
Last Verified: April 4, 2012
Keywords provided by National Institutes of Health Clinical Center (CC):
Macular Degeneration
Retinal Images
Risk Factors
Linkage Analysis
Additional relevant MeSH terms:
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Macular Degeneration
Retinal Degeneration
Retinal Diseases
Eye Diseases