Text Size

Asymptomatic Narrow Angles - Laser Iridotomy Study; Multicentric RCT

The recruitment status of this study is unknown because the information has not been verified recently.
Verified June 2006 by Singapore National Eye Centre.
Recruitment status was  Recruiting
Sponsor:
Collaborator:
National Medical Research Council (NMRC), Singapore
Information provided by:
Singapore National Eye Centre
ClinicalTrials.gov Identifier:
NCT00347178
First received: June 30, 2006
Last updated: NA
Last verified: June 2006
History: No changes posted
  Purpose

This is a multicentric, randomised, controlled study comparing Laser Iridotomy (LI) to no treatment in subjects with asymptomatic narrow angles (ANA).One eye of each subject with ANA will be randomised to undergo LI and the other eye will be left alone and will serve as an internal control. Subjects are proposed to be followed up once a year for 5 years.


Condition Intervention
Asymptomatic Narrow Angles
Primary Angle Closure Suspects
 Procedure: Laser Peripheral Iridotomy

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Prevention
Official Title: Prophylactic Laser Iridotomy for Eyes With Narrow Drainage Angles; A Randomised Controlled Trial

Further study details as provided by Singapore National Eye Centre:

Primary Outcome Measures:
  • Peripheral anterior synechiae formation
  • IOP elevation >21 mm Hg
  • Development of acute angle closure event

Secondary Outcome Measures:
  • Changes in the grading of Modified Schaffer Grading
  • Development of glaucomatous optic neuropathy
  • Development of corresponding visual field loss by automated perimetry
  • Change in HRT optic disc parameters
  • Change in UBM angle parameters
  • Formation of disc pallor

Estimated Enrollment: 544
Study Start Date: January 2005
Estimated Study Completion Date: January 2013
Detailed Description:

Objective: This study will compare LI versus no treatment in subjects with asymptomatic narrow angles, the anatomical trait that predisposes to primary angle closure glaucoma (PACG), in order to assess the effectiveness of prophylactic treatment in the prevention of blindness due to PACG.

Eligibility: 1. Bilateral Narrow angles; 2. Age 50 years and above; 3. Informed consent obtained prior to or at baseline visit.

Trial Design: Subjects with asymptomatic ANA undergoes randomisation after comprehensive ocular exam followed by randomisation to LI in one eye and no treatment in the other eye. Follow up is done for 5 years with yearly examination.

  Eligibility

Ages Eligible for Study:   50 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  1. Bilateral Narrow angles
  2. Age 50 years and above
  3. Informed consent obtained prior to or at baseline visit

Exclusion Criteria:

  1. Presence of PAS
  2. IOP > 21 mm Hg
  3. Glaucomatous optic neuropathy and/or CDR > 0.7
  4. Secondary angle closure such as uveitis, neovascularisation etc.
  5. Prior intraocular surgery or penetrating eye injury
  6. Corneal disorders such as corneal endothelial dystrophy except mild corneal guttae
  7. Evidence of prior acute angle closure event
  8. High risk of acute angle closure.
  9. Significant cataract and visual acuity less than 20/40
  10. Constant use of contact lens for refractive correction
  11. Chronic use of topical or systemic steroids
  12. Established retinopathies on ocular treatments (e.g. Diabetic)
  13. Any other disease which is likely to cause field loss in next 3 years
  14. Severe health problems decreasing life expectancy to less than one year.
  Contacts and Locations
Please refer to this study by its ClinicalTrials.gov identifier: NCT00347178

Contacts
Contact: Tin - Aung, FRCSEd PhD +65 63224581 ext -

Locations
Singapore
Singapore Eye Research Institute Recruiting
Singapore, Singapore, 168751
Principal Investigator: Tin Aung, FRCSEd, PhD            
Sub-Investigator: Steve KL Seah, FRCS (Ed)            
Sub-Investigator: Paul TK Chew, FRCS (Ed)            
Sub-Investigator: Hon T Wong, FRCS (Ed)            
Sub-Investigator: Aliza - Jap, FRCOph (Lon)            
Sub-Investigator: Kah G AuEong, FRCS (Ed)            
Sponsors and Collaborators
Singapore National Eye Centre
National Medical Research Council (NMRC), Singapore
Investigators
Principal Investigator: Tin - Aung, FRCSEd PhD Singapoe National Eye Centre
  More Information

No publications provided

ClinicalTrials.gov Identifier: NCT00347178     History of Changes
Other Study ID Numbers: R358/16/2004
Study First Received: June 30, 2006
Last Updated: June 30, 2006
Health Authority: Singapore: Clinical Trials & Epidemiology Research Unit (CTERU)

Keywords provided by Singapore National Eye Centre:
Asymptomatic Narrow Angles
Primary Angle Closure Suspects
Laser Peripheral Iridotomy
Randomised Controlled Trial

ClinicalTrials.gov processed this record on June 18, 2013