Magnetic Resonance Imaging to Study the Normal Eye

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: NCT00005911
Recruitment Status : Completed
First Posted : June 14, 2000
Last Update Posted : March 4, 2008
Information provided by:
National Institutes of Health Clinical Center (CC)

Brief Summary:

This study will assess the value of improved magnetic resonance imaging (MRI) techniques to study the lens of the human eye. Knowledge of how cataracts develop and progress has been hampered by the lack of human tissue available for study; MRI may provide an effective means for learning more about this eye disease.

Normal volunteers between 18 and 70 years of age may be eligible for this study. Participants will undergo a medical history and complete eye examination, including vision assessment, eye pressure measurement, lens and retina examinations, and photography of the eye.

MRI scans will be scheduled for a second visit. For this procedure, the volunteer's pupils are dilated and he or she then lies on a stretcher that is moved into a cylinder containing a magnetic field. A device similar to a welder's helmet is placed on the head. Attached to the device are an imaging probe and a small blinking light. The probe receives radio signals from the eye that a computer converts into images. During imaging, the participant gazes at the blinking light; this helps keep the eyes from blinking and wandering. Scan times vary from 2 to 10 minutes; the total time for the study is less than an hour.

Condition or disease
Cataract Lens Disease

Detailed Description:
Studies of human diabetic cataract and age related cataract formation have been hampered by unavailability of human tissues especially in the early stages of the disease. Eye bank tissues are first used for cornea transplants so that by the time they become available for basic research studies, the lens is no longer suitable for biochemical nor histological studies. Cataracts usually only become available after extraction which is at the end stage of their development. However, appropriate surgical lens specimens are no longer available because cataracts are generally extracted by the destructive phakoemulsification technique. Therefore, noninvasive techniques are required in order to study the lens in vivo.

Study Type : Observational
Enrollment : 20 participants
Official Title: Refinement of the Magnetic Resonance Imaging Technique for the Study of the Normal Eye, Particularly the Lens and Cataract
Study Start Date : June 2000
Study Completion Date : August 2002

Resource links provided by the National Library of Medicine

U.S. FDA Resources

Information from the National Library of Medicine

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Ages Eligible for Study:   Child, Adult, Senior
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Must be between 18 and 70 years of age of either sex.

Must not have uveitis, glaucoma, or be at risk for an adverse reaction to dilation or have a history of allergic reaction to one of lthe dilating agents to be used.

Must not have any metallic prosthesis, cardiac pacemakers, neural pacemakers, surgical clips in the brain or on blood vessels, surgically implanted metal plates, screws or pins, cochlear implants or metal objects in the body especially in the eye.

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): NCT00005911

United States, Maryland
National Eye Institute (NEI)
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Eye Institute (NEI)

Publications: Identifier: NCT00005911     History of Changes
Other Study ID Numbers: 000151
First Posted: June 14, 2000    Key Record Dates
Last Update Posted: March 4, 2008
Last Verified: August 2002

Keywords provided by National Institutes of Health Clinical Center (CC):
Magnetic Resonance Imaging
Human Eye
Normal Volunteers
Human Lens
Healthy Volunteer

Additional relevant MeSH terms:
Lens Diseases
Eye Diseases