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Variables in intraocular lens (10L) power calculations include axial length, average dioptric power of the cornea, and an assumed Pseudophakie anterior chamber depth (ACD). In the case of transscleral suturefixated posterior chamber (PC) IO Ls, ACD depends on the placement of the suture and thus might be expected to vary more than it does in eyes with capsular-fixated IOLs. To assess the degree of this variation, we determined the postoperative Pseudophakie ACD using ?-scan ultrasonography in 15 patients with transscleral suture-fixated PC-IOLs. The mean Pseudophakie ACD (posterior corneal vertex to anterior pseudophakos) was 3.47 ± 0.69 mm. The mean absolute discrepancies in ACD between these measured values and those predicted by the original Binkhorst and the most recent Holladay formulas were 0.579 ± 0.513 mm and 0.639 ± 0.519 mm, respectively. In 11 of 15 eyes, the measured ACD was within 1 mm of that predicted by either the Binkhorst or Holladay formula, suggesting that either will provide reasonable estimates of ACD for IOL power calculations for suture-fixated PC-IOLs.

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