Classification of Foster et al for Conditions with Primary Angle Closure (PAC)

 

Parameters:

(1) occludable drainage angle between peripheral iris and the posterior trabecular meshwork

(2) evidence of trabecular obstruction by the peripheral iris

(3) glaucomatous damage involving the optic disc

 

For epidemiological studies the occludable drainage angle may be defined as an angle in which >= 270° of the posterior trabecular network cannot be seen

 

Evidence of trabecular occlusions - one or more of the following:

(1) peripheral anterior synechiae

(2) elevated intraocular pressure

(3) iris whirling (distortion of the radially oriented iris fibers)

(4) glaucomfleken lens opacities

(5) excessive pigment deposition on the trabecular surface

Occludable Drainage Angle	Evidence of Trabecular Obstruction	Damage of Optic Disc	Diagnosis
absent	absent	absent	PAC negative
present	absent	absent	PAC suspect
present	present	absent	PAC present
present	present	present	PAC glaucoma