This site became the new on June 19th. Learn more.
Show more Menu IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more... Menu IMPORTANT: Talk with a trusted healthcare professional before volunteering for a study. Read more... Menu
Give us feedback

Pigment Dispersion Syndrome With and Without Glaucoma

This study has been completed.
Information provided by:
National Institutes of Health Clinical Center (CC) Identifier:
First received: November 3, 1999
Last updated: March 3, 2008
Last verified: May 1998
To compare patients having PDS without and with OH or GL by documenting and following the clinical features and course of their disease and evaluating the patient's performance on a variety of diagnostic tests.

Glaucoma Glaucoma, Open-Angle Ocular Hypertension

Study Type: Observational
Official Title: Pigment Dispersion Syndrome With and Without Glaucoma

Resource links provided by NLM:

Further study details as provided by National Institutes of Health Clinical Center (CC):

Estimated Enrollment: 175
Study Start Date: June 1976
Estimated Study Completion Date: June 2000
Detailed Description:

Pigment dispersion syndrome (PDS) is not an uncommon ocular condition and is frequently associated with myopia. There is loss of pigment from the posterior iris, seen clinically in most cases as iris transillumination with pigment deposited on the corneal endothelium, iris surface and on the angle structures overlying Schlemm's canal. In a subset of patients ocular hypertension or glaucoma may develop.

Ocular hypertension is defined as 3 separate measurements of the intraocular pressure greater than 22 mm/Hg in the absence of visual field loss. Glaucoma is defined as the presence of a characteristic field defect (Bjerrum scotoma, nasal step or arcuate scotomas) with intraocular pressures greater than 22 mm/Hg measured sometime during a diurnal curve testing.

The etiology of this condition is not known. Hypotheses include developmental abnormalities of the iris dilator muscle or mechanical rubbing of zonules against the iris, resulting in pigment dispersion in the anterior chamber and pressure elevation. PDS is then viewed as a variant of primary open-angle glaucoma or may be secondary to pigment deposited in the angle structures with secondary damage to the trabecular meshwork. A hereditary component does appear to play a role in the PDS syndrome and may also predispose to the development of glaucoma.

The purpose of this study is to evaluate and determine the risk factors that differentiate patients with PDS, PDS+OH, or PDS+GL by documenting the ophthalmic findings and following their clinical course. In order to do this, diagnostic tests including intraocular pressure and visual fields will be performed. This data may make it possible to determine the risk of patients having PDS of developing OH, GL or other possibly associated findings such as retinal detachment or cataract. In addition, patients with "pigmentary glaucoma (PG)" will be compared to those with the known characteristics of primary open-angle glaucoma (POAG) to determine whether PG is different than or a variant of POAG. When possible, family members will be examined to investigate the inheritance pattern of this syndrome and its relationship to POAG.


Ages Eligible for Study:   Child, Adult, Senior
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Entrance into the study will depend upon clinical evidence of black pigment deposition on trabecular meshwork at the site of Schlemm's canal and at least one of the following: Kruckenberg spindle, pigment deposition on iris surface, or mid-stromal iris transillumination.

No patients with other ocular disease or disorders (uveitis, trauma, pseudoexfoliation, ICE syndrome, etc.)

  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00001152

United States, Maryland
National Eye Institute (NEI)
Bethesda, Maryland, United States, 20892
Sponsors and Collaborators
National Eye Institute (NEI)
  More Information

Publications: Identifier: NCT00001152     History of Changes
Other Study ID Numbers: 760189
Study First Received: November 3, 1999
Last Updated: March 3, 2008

Keywords provided by National Institutes of Health Clinical Center (CC):
Aqueous Humor Dynamics
Ocular Hypertension
Pigment Dispersion Syndrome
Primary Open Angle Glaucoma
Pseudo-Exfoliation of the Lens Capsule

Additional relevant MeSH terms:
Ocular Hypertension
Glaucoma, Open-Angle
Vascular Diseases
Cardiovascular Diseases
Eye Diseases processed this record on September 21, 2017