Dynamic Light Scattering Device (DLS) Study of Age-Related Changes in the Lens and Cataracts

This study has been completed.
Sponsor:
Information provided by:
National Institutes of Health Clinical Center (CC)
ClinicalTrials.gov Identifier:
NCT00007215
First received: December 15, 2000
Last updated: March 3, 2008
Last verified: February 2004

December 15, 2000
March 3, 2008
December 2000
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Complete list of historical versions of study NCT00007215 on ClinicalTrials.gov Archive Site
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Dynamic Light Scattering Device (DLS) Study of Age-Related Changes in the Lens and Cataracts
A Study of Age-Related Changes in the Human Lens and Cataracts In Vivo Using Dynamic Light Scattering Device (DLS) Combined With Keratoscopy

This study will use a newly developed instrument called dynamic light scattering device (DLS) to examine age-related changes in the human lens and to study the causes and development of cataracts. DLS uses a low intensity laser light (similar to that used in supermarket checkouts) to measures lens cloudiness. It detects changes in the human lens at the earliest stages, when anti-cataract treatment would be most effective in reversing, delaying or preventing cataract formation.

Patients 18 years of age and older with cataracts and normal volunteers between the ages of 18 and 70 years may be eligible for this study. Participants will have a standard eye examination, including a vision check, pressure measurement, lens examination using DLS and examination of the retina. Photographs of the lens or retina, or both, may be taken.

This study does not involve treatment. No anti-cataract medications will be given.

Recently, a device has been created to determine molecular interactions that occur in the nucleus of the lens, called Dynamic Light Scattering Device (DLS). Preliminary studies have shown its potential in the detection of the earliest changes occurring in cataract, at the stage where anticataract treatment would theoretically be most effective in reversing, delaying or preventing cataracts. A new miniaturized version of this device has been developed by NASA using lower energy lasers and offered for further development and testing at the NEI. We recently conducted a pilot study to evaluate the usefulness and reproducibility of this instrument for quantitating lens changes, and found good reproducibility. We also determined that the most useful parameter to use is mean particle size derived from particle size distribution. We therefore propose to conduct a study on changes on the lens due to aging (age related changes), as well as on the three representative types of cataracts (nuclear, cortical and PSC).

Observational
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  • Cataract
  • Healthy
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*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
 
Completed
24
February 2004
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INCLUSION:

Patients 18 years or older will be admitted to this study.

There will be no gender or sex bias in the recruitment.

Fifteen subjects (30 eyes) who are normal volunteers of either sex, 3 for each decade from 18-70, will be recruited.

These normal volunteers should have clear lenses with LOCS II clinical score for nuclear opalescence of 0.5 or less.

Three patients (18 eyes) for each major type of cataract (nuclear, cortical and PSC), will be recruited also for evaluation with the DLS device.

All 3 types of cataracts will be graded using the LOCS II system and will have a clinical score of at least one.

EXCLUSION:

Patients who have uveitis, glaucoma and 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.

Both
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Yes
Contact information is only displayed when the study is recruiting subjects
United States
 
NCT00007215
010051, 01-EI-0051
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National Eye Institute (NEI)
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National Institutes of Health Clinical Center (CC)
February 2004

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP