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Protocol Number:
04-EI-0166
- Title:
A Cross Sectional Clinical Study of Human Lens Aging and Cataract Formation, in Vivo, Using Dynamic Light Scattering (DLS)
- Number:
04-EI-0166
- Summary:
This study will use dynamic light scattering (DLS) technology to study normal lens aging and early cataract formation. Cataract is a clouding of the lens that interferes with the passage of light to the retina, impairing visual acuity. DLS uses a low intensity laser light (similar to that used in supermarket checkouts) to measure lens cloudiness. It detects changes in the human lens at the earliest molecular stages of cataract development, when anti-cataract treatment would be most effective in reversing, delaying or preventing cataract formation.
Healthy normal volunteers and patients with age-related cataract between 18 and 80 years of age may be eligible for this study. Participants undergo the following tests and procedures:
Medical history
Eye examination, including the following:
- Measurement of visual acuity (vision chart)
- Measurement of eye pressure
- Dilation of the pupils for slit lamp (microscope) examination and grading of lens opacity
- Ultrasound examination of the eye to determine distances between cornea, lens (including lens thickness), and retina
- Examination of the retina at the back of the eye
- Dynamic light scattering of the lens (see below)
- Lens photography using a camera with a bright flash
For the DLS procedure, the patient sits in front of the DLS device with his or her chin placed on a chin rest and fixes on a yellow target in the center of the camera lens. When the eye is properly aligned, DLS measurements are taken on the lens.
- Sponsoring Institute:
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National Eye Institute (NEI)
- Recruitment Detail
- Type:
Active Accrual Of New Subjects
- Gender:
Male & Female
- Referral Letter Required:
No
- Population Exclusion(s):
Children
- Eligibility Criteria:
INCLUSION CRITERIA:
Patients aged 18-80 years will be admitted to this study. There will be no racial or gender bias in the recruitment.
227 patients with AREDS Clinical Grades 2 or less for nuclear cataract, will be enrolled in the study. 40 patients with AREDS nuclear cataract grade 3 and 4 will also be enrolled.
For those patients enrolled from the AREDS population, only one eye will be evaluated for this protocol. The eye to be examined will be defined as follows: If the patient has only one eligible eye, that eye will be examined. If the patient's birth month is an even number, the right eye will be examined; if the patient's birth month is odd, the left eye will be examined.
EXCLUSION CRITERIA:
Subjects who have tear film disorders, corneal opacities or disorders, uveitis, glaucoma or who have difficulty fixating, will be excluded.
Subjects who are thought to be at risk for an adverse reaction to pupil dilation, or have a history of allergic reaction to one of the dilating agents that will be used, will be excluded.
- Special Instructions:
Currently Not Provided
- Keywords:
-
Cataract
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Blindness
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Clinical
-
Human Aging
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Dynamic Light Scattering (DLS)
-
Aging-Related Lens Changes
-
Early Cataract
-
Lens
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AREDS Grading
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In Vivo
- Recruitment Keywords:
-
Cataract
-
Healthy Volunteer
- Conditions:
-
Cataract
- Investigational Drug(s):
- None
- Investigational Device(s):
- None
- Contacts:
-
Patient Recruitment and Public Liaison Office
Building 61 10 Cloister Court Bethesda, Maryland 20892-4754 Toll Free: 1-800-411-1222 TTY: 301-594-9774 (local),1-866-411-1010 (toll free) Fax: 301-480-9793 Electronic Mail:prpl@mail.cc.nih.gov
- Citations:
-
Benedek GB, Chylack LT Jr, Libondi T, Magnante P, Pennett M.
Quantitative detection of the molecular changes associated with early cataractogenesis in the living human lens using quasielastic light scattering. Curr Eye Res. 1987 Dec;6(12):1421-32. PMID: 3427992
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Datiles M, Podgor M, Edwards P. Reproducibility of the Early Cataract Detector (Kowa ECD 2000). Ophthalmic Surg. 1988 Sep;19(9):664-6. PMID: 3186178
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Bursell SE, Baker RS, Weiss JN, Haughton JF, Rand LI. Clinical photon correlation spectroscopy evaluation of human diabetic lenses. Exp Eye Res. 1989 Aug;49(2):241-58. PMID: 2767171
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Warren Grant Magnuson Clinical Center (CC) National Institutes of Health (NIH)
Bethesda, Maryland 20892. Last update: 10/23/2004
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