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Pigment Dispersion Syndrome: Natural History and Possible Protective Effect of a YAG Laser Iridotomy

This study has been completed.
Sponsor:
ClinicalTrials.gov Identifier:
NCT01053416
First Posted: January 21, 2010
Last Update Posted: January 22, 2010
The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
Information provided by:
University of Parma
  Purpose

STUDY AIMS

  1. To determine the 10-year conversion rate from pigment dispersion syndrome (PDS) to pigmentary glaucoma (PG)
  2. To evaluate the possible protective effect of a Yag-laser iridotomy

Condition Intervention
Pigment Dispersion Syndrome Procedure: Yag laser iridotomy

Study Type: Interventional
Study Design: Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single (Investigator)
Primary Purpose: Prevention
Official Title: 10-year Follow up of Patients With Pigment Dispersion Syndrome: Risk Factors for Conversion to Pigmentary Glaucoma and Potential Protective Effect of a Yag-laser Iridotomy in High Risk Eye

Resource links provided by NLM:


Further study details as provided by University of Parma:

Primary Outcome Measures:
  • > 5 mmHg IOP increase vs baseline (average 2 highest readings, 8 am - 6 pm phasing, 6 readings) [ Time Frame: 10 years ]

Enrollment: 72
Study Start Date: January 1993
Study Completion Date: December 2003
Primary Completion Date: April 2003 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
No Intervention: observation
Experimental: Yag laser iridotomy
the enrolled eyes will undergo an iridotomy performed by using a Yag-laser
Procedure: Yag laser iridotomy
the procedure will be performed by using a Yag laser. Single spot, 1 mJ power, beam aimed to an existing iris crypt
Other Name: iridectomy

Detailed Description:

1154 workers in the Parma area will be screened for eligibility to long-term use of video-monitors. Those referred to the Glaucoma Clinic for suspected PDS will be enrolled in the study.

In a prospective study on the natural history of PDS and PG, Richter et al. (Arch Ophtal 104:211-5, 1986) found an association between "active pigment dispersion" and elevated IOP. Therefore, in order to evaluate the "stability" of the pigment, a phenylephrine test will be performed following the method reported by Epstein et al (1978) AJO 85:43-50. The test will be performed by one investigator (SAG)and was considered positive if > "grade 1+" (i.e. at least 10 particles in a single light beam). Eyes showing a positive test will be considered as "high-risk" for conversion to PG.

Yag laser iridotomy will be performed in patients showing both eyes at high risk. One eye only (randomly chosen) will be treated. the fellow eye will be left untreated and considered as internal control.

Low risk eyes will be followed without any intervention.

  Eligibility

Information from the National Library of Medicine

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

Inclusion Criteria:

  • Krukenberg spindle
  • Slit-like mid peripheral iris defect
  • Pigment in > 270° of AC angle

Exclusion Criteria:

  • IOP > 18 mmHg
  • PEX (full mydriasis)
  • w/w field defect (Octopus G1 program)
  Contacts and Locations
Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01053416


Locations
Italy
Sezione Di Oftalmologia, Universita' Di Parma
Parma, Italy, 43100
Sponsors and Collaborators
University of Parma
  More Information

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):
Responsible Party: STEFANO A. GANDOLFI, PROFESSOR OF OPHTHALMOLOGY AND CHAIRMAN, UNIVERSITY OF PARMA
ClinicalTrials.gov Identifier: NCT01053416     History of Changes
Other Study ID Numbers: PARMAPIGMO
First Submitted: January 20, 2010
First Posted: January 21, 2010
Last Update Posted: January 22, 2010
Last Verified: January 2003

Keywords provided by University of Parma:
glaucoma
pigmentary glaucoma
laser iridotomy

Additional relevant MeSH terms:
Syndrome
Glaucoma, Open-Angle
Disease
Pathologic Processes
Glaucoma
Ocular Hypertension
Eye Diseases