Dynamic Light Scattering for Studying Lens Aging and Cataract Formation
Public ClinicalTrials.gov record NCT00081991. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Official title
A Cross Sectional Clinical Study of Human Lens Aging and Cataract Formation, in Vivo, Using Dynamic Light Scattering (DLS)
Brief summary
Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.
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.
Study identification
- NCT ID
- NCT00081991
- Recruitment status
- Completed
- Study type
- Observational
- Phase
- Not listed
- Enrollment
- 267 participants
Conditions and interventions
Conditions
Interventions
Not listed
Eligibility (public fields only)
- Age range
- Not listed
- Sex
- All
- Healthy volunteers
- Accepts healthy volunteers
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Mar 31, 2004
- Primary completion
- Not listed
- Completion
- Mar 31, 2005
- Last update posted
- Mar 3, 2008
2004 – 2005
United States locations
- U.S. sites
- 1
- U.S. states
- 1
- U.S. cities
- 1
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| National Eye Institute (NEI) | Bethesda | Maryland | 20892 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT00081991, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Mar 3, 2008 · Synced Sep 4, 2026
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Open the official record
The complete protocol, eligibility criteria, and contact information for NCT00081991 live on ClinicalTrials.gov.