title: Measured and predicted anterior chamber depth for transscleral suture-fixated posterior chamber intraocular lenses.
abstract: Variables in intraocular lens (IOL) power calculations include axial length, average dioptric power of the cornea, and an assumed pseudophakic anterior chamber depth (ACD). In the case of transscleral suture-fixated posterior chamber (PC) IOLs, 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 pseudophakic ACD using A-scan ultrasonography in 15 patients with transscleral suture-fixated PC-IOLs. The mean pseudophakic 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.
authors.affiliation: Department of Ophthalmology, Kresge Eye Institute, Wayne State University School of Medicine, Detroit, Mich. 48201.
authors.forename: D M
authors.initials: DM
authors.lastname: Corder
authors.forename: M L
authors.initials: ML
authors.lastname: McDermott
authors.forename: D H
authors.initials: DH
authors.lastname: Shin
authors.forename: K A
authors.initials: KA
authors.lastname: Parrow
authors.forename: L K
authors.initials: LK
authors.lastname: Lau-Sickon
mesh_terms: D000867:Anterior Chamber / Q000033:anatomy & histology* / Q000000981:diagnostic imaging; D000886:Anthropometry; D002387:Cataract Extraction / Q000379:methods; D006801:Humans; D007910:Lenses, Intraocular; D008954:Models, Biological; D011237:Predictive Value of Tests; D012590:Sclera; D013536:Suture Techniques; D014463:Ultrasonography