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Peripheral anterior synechiae formation after trabeculoplasty
H J Rouhiainen1, M E Teräsvirta, E J Tuovinen
1Eye Department, University Central Hospital of Kuopio, Finland.
Archives of Ophthalmology (Chicago, Ill. : 1960)
|February 1, 1988
Summary
Argon laser trabeculoplasty (ALT) can cause peripheral anterior synechiae (PAS). Lower laser power and anterior targeting minimize PAS risk, which can reduce intraocular pressure reduction effectiveness.
Area of Science:
- Ophthalmology
- Glaucoma Research
- Laser Therapy
Background:
- Primary open angle glaucoma and capsular glaucoma are common causes of vision loss.
- Argon laser trabeculoplasty (ALT) is a standard treatment for glaucoma.
- Peripheral anterior synechiae (PAS) are a potential complication of ALT.
Purpose of the Study:
- To investigate the incidence of PAS after ALT.
- To determine the impact of laser power and location on PAS formation.
- To assess the effect of PAS on intraocular pressure reduction following ALT.
Main Methods:
- ALT was performed on 119 eyes with glaucoma (60 primary open angle, 59 capsular).
- Laser power varied from 500 to 800 mW, targeting anterior or posterior trabecular meshwork.
- Gonioscopy assessed PAS formation before and six months after ALT.
Main Results:
- PAS developed in 22% of eyes.
- No PAS occurred with 500-mW anterior burns; 40% incidence with 800-mW posterior burns.
- PAS formation was not correlated with patient demographics or surgical factors, except laser parameters.
- Eyes with PAS showed significantly smaller intraocular pressure decrease after ALT.
Conclusions:
- ALT parameters, specifically laser power and treatment location, influence PAS development.
- Minimizing laser power and targeting the anterior trabecular meshwork can reduce PAS risk.
- PAS formation negatively impacts the efficacy of ALT in lowering intraocular pressure.