Fig. 11. A. The secondary membrane shows a vertical strand surrounded by areas of thin capsule. Treatment on either side of the strand (1, 2), followed by treatment of the strand (3) will cause the capsule to open. B. Additional applications (4, 5) will increase the aperture. C. Further opening can be achieved with treatment of the edges of the opening (6, 7). (Drawings courtesy of Kenneth P. Cheng, MD.)