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Instruments and techniques for anterior chamber implants.

The widely used white-to-white + 1 method was investigated clinically for its accuracy in choosing implant length. This method allowed the surgeon to open one implant per case in approximately 65% of cases. The basic concept of adding 1 mm to the clear corneal diameter was then investigated with cadaver eyes. The concept was found to be quite inaccurate. An anterior chamber ruler is described that allows the surgeon to open one implant per case in 95% of cases. An implant ruler for checking the length of the implant and the plane of the feet also is described. An implant positioner is described that inserts the distal feet, inserts the proximal feet, checks the implant fit, and changes the axis if necessary.