Fig. 17 A. Normal anatomy. B. Cyclocongestive glaucoma. Scleral buckling and other conditions may obstruct vortex venous outflow, resulting in choroidal congestion and detachment. Swelling of the ciliary body rotates this structure about the scleral spur, closing the peripheral angle. Note the loss of visible angle structures. Laser iris retraction is the treatment of choice in cases resistant to conservative therapy (cycloplegics, topical corticosteroids, timolol maleate, and acetazolamide).