Vector analysis terminology.

Reply : The IOL we currently use is the Morcher type 67B (Morcher GmBH). There is a 10.0 mm opaque black PMMA diaphragm with a 3.0 mm central transparent optical area in the IOL. Before January 2008, we used the 67G IOL, which has a 5.0 mm transparent optical area; however, most patients had obvious photophobia under strong sunlight after IOL implantation. Moreover, because the PMMA is not foldable, a 10.0 mm to 11.0 mm scleral tunnel is required for implantation of the IOL, so the incision is liable to bleed or induce astigmatism. In previous clinical observations, we found that the long-term complications after black diaphragm IOL implantation in traumatic aniridia were related to the preoperative degrees of damage to the anterior chamber angle and iris defects, as well as to the position of the implanted IOL. Currently, we have detected 15 cases of failure due to complications of secondary glaucoma and corneal endothelial decompensation. The IOL positionwas abnormal in all the eyes, and forward migration was observed in most. Our technical improvement was based on this finding. The inclusion criteria for black diaphragm IOL implantation included corneal endothelial cell count (ECC) equal to or more than 1500 cells/mm, no retinal detachment, and no anterior proliferative vitreous retinopathy. There seemed to be no statistical difference in preoperative corneal ECC between the cases of failure and success. Details will be reported in another manuscript. From September 1998 to April 2012, we completed 632 cases of IOL suspension surgery (including types 67G, 67B, CZ70BD, and AR40e) using 10-0 polypropylene sutures. Of them, 11 cases (1.74%) had IOL dislocation because of suture loosening or breaking.