While individuals with aniridia have higher-order optical aberrations associated with an increased ratio of pupillary aperture to focal length, they often experience further aberrations following cataract surgery. In 1994, the black diaphragm intraocular (BDI) lens was developed to counter these optical effects. This current study by Aslam et al. evaluated the accuracy of biometry, visual outcomes and long-term changes in 40 eyes of 35 patients with congenital and traumatic aniridia implanted with the BDI lens......Results showed that the mean biometry prediction error was equivalent to 80 percent of target eyes being within 2 D of predicted refraction. The main complication was glaucoma, which occurred immediately after surgery—suggesting a possible direct mechanical effect of the large BDI lens. Visual outcomes were better when using the BDI lens for traumatic aniridia than for congenital aniridia
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