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Clinical Trial Details — Status: Completed

Administrative data

NCT number NCT00050466
Other study ID # 030012
Secondary ID 03-EI-0012
Status Completed
Phase N/A
First received December 9, 2002
Last updated March 3, 2008
Start date December 2002
Est. completion date September 2005

Study information

Verified date September 2005
Source National Institutes of Health Clinical Center (CC)
Contact n/a
Is FDA regulated No
Health authority United States: Federal Government
Study type Observational

Clinical Trial Summary

This pilot study will examine the usefulness of a new instrument called the Dynamic Light Scattering (DLS) device for documenting and monitoring changes in the cornea, the front part of the eye where contact lenses are placed. The DLS device uses a low-intensity laser similar to that used in supermarket checkouts to measure the cloudiness of the cornea. The results of this study may lead to further investigations using DLS to discover the cause of corneal clouding and to develop treatments to prevent it.

Healthy volunteers and patients with corneal clouding or opacification 18 years of age and older may be eligible for this study.

Participants will have a standard eye examination, including a check of visual acuity and eye pressure. The retina will also be examined and photographs of the cornea may be taken. For the DLS test, the subject sits in front of the device and looks at a yellow-green target while the cloudiness of the cornea is measured. Subjects will be tested four times. The entire procedure takes less than 30 minutes.


Description:

Corneal disease and injuries are the leading cause of visits to eye care clinics in the US today. These diseases are also some of the most painful eye disorders. Two important areas for research on the cornea are 1) to explore and understand the molecular basis of corneal transparency and 2) to analyze the molecular nature of corneal inflammation and wound healing. We have developed a new clinical device to understand molecular changes that occur in the lens, called Dynamic Light Scattering (DLS) device. Studies have shown its potential in the detection of the earliest changes occurring in the cataract, and have also shown good test retest reproducibility of the system. We now would like to apply this technique to study changes that occur in corneal opacification. In this pilot project, we would like to study the normal cornea in young and older persons (volunteers) as well as cloudy, opaque corneas. This will allow us to determine if useful data can be obtained, and if so, lead to further studies in various corneal disorders caused by trauma, infections, and dystrophies, as well as those caused by systemic or inherited disorders.


Recruitment information / eligibility

Status Completed
Enrollment 24
Est. completion date September 2005
Est. primary completion date
Accepts healthy volunteers Accepts Healthy Volunteers
Gender Both
Age group N/A and older
Eligibility INCLUSION CRITERIA:

Individuals greater than or equal to 18 years of age.

Controls:

Control subjects must have normal, clear corneas as determined by slit lamp biomicroscopy and central corneal thickness less than 0.55 mm centrally.

Patients:

Patients with corneal clouding and opacification.

EXCLUSION CRITERIA:

To be eligible, participants must not satisfy the criterion below:

Individuals who cannot cooperate or keep still for the DLS measurements.

Study Design

N/A


Related Conditions & MeSH terms


Locations

Country Name City State
United States National Eye Institute (NEI) Bethesda Maryland

Sponsors (1)

Lead Sponsor Collaborator
National Eye Institute (NEI)

Country where clinical trial is conducted

United States, 

References & Publications (3)

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. — View Citation

Datiles MB 3rd, Ansari RR, Reed GF. A clinical study of the human lens with a dynamic light scattering device. Exp Eye Res. 2002 Jan;74(1):93-102. — View Citation

Thurston GM, Hayden DL, Burrows P, Clark JI, Taret VG, Kandel J, Courogen M, Peetermans JA, Bowen MS, Miller D, Sullivan KM, Storb R, Stern H, Benedek GB. Quasielastic light scattering study of the living human lens as a function of age. Curr Eye Res. 1997 Mar;16(3):197-207. — View Citation

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