Dynamic Light Scattering Device (DLS) Study of Age-Related Changes in the Lens and Cataracts
|First Submitted Date||December 15, 2000|
|First Posted Date||December 18, 2000|
|Last Update Posted Date||March 4, 2008|
|Start Date||December 2000|
|Primary Completion Date||Not Provided|
|Current Primary Outcome Measures||Not Provided|
|Original Primary Outcome Measures||Not Provided|
|Change History||Complete list of historical versions of study NCT00007215 on ClinicalTrials.gov Archive Site|
|Current Secondary Outcome Measures||Not Provided|
|Original Secondary Outcome Measures||Not Provided|
|Current Other Outcome Measures||Not Provided|
|Original Other Outcome Measures||Not Provided|
|Brief Title||Dynamic Light Scattering Device (DLS) Study of Age-Related Changes in the Lens and Cataracts|
|Official Title||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.
|Detailed Description||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).|
|Study Design||Not Provided|
|Target Follow-Up Duration||Not Provided|
|Sampling Method||Not Provided|
|Study Population||Not Provided|
|Study Groups/Cohorts||Not Provided|
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
|Estimated Completion Date||February 2004|
|Primary Completion Date||Not Provided|
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.
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.
|Ages||Child, Adult, Senior|
|Accepts Healthy Volunteers||Yes|
|Contacts||Contact information is only displayed when the study is recruiting subjects|
|Listed Location Countries||United States|
|Removed Location Countries|
|Other Study ID Numbers||010051
|Has Data Monitoring Committee||Not Provided|
|U.S. FDA-regulated Product||Not Provided|
|IPD Sharing Statement||Not Provided|
|Responsible Party||Not Provided|
|Study Sponsor||National Eye Institute (NEI)|
|PRS Account||National Institutes of Health Clinical Center (CC)|
|Verification Date||February 2004|