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Home > "M" Clinical Trials Conditions > Magnetic Resonance Imaging to Study the Normal Eye  Magnetic Resonance Imaging to Study the Normal Eye
Magnetic Resonance Imaging to Study the Normal Eye
For Condition: Cataract,Lens Disease
Status: Completed
Sponsor(s): National Eye Institute (NEI) ,
Synopsis: 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.
Details: 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.
Eligibility:
Study Type: Observational, Natural History
Minimum Age/Maximum Age: /
Genders: Both
Protocol Entry Criteria: 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.
Total Enrollment: 20
Location and Contact Information:
National Eye Institute (NEI)
Bethesda, Maryland, 20892
United States
Additional Information:
Study ID Numbers: 000151; 00-EI-0151
Study Start Date: June 9, 2000
Record last reviewed: August 12, 2002
Additional information available at: clinicaltrials.gov
Clinicaltrials.gov Reference link: NCT00005911
Other Lens Disease Studies:
1. Pilot Study: Dynamic Light Scattering Device for Studying Early Changes in Cataract
2. Studies of Families with Hereditary Cataracts
3. Randomized Trial of Aspirin and Cataracts in U.S. Physicians
4. Long Term Follow-Up of Diabetic Retinopathy
5. Age-Related Macular Degeneration and Cataract
Related Studies:
Other Lens Disease Clinical Trials
Other Maryland Clinical Trials
Other Bethesda Clinical Trials
Magnetic Resonance Imaging to Study the Normal Eye
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