title: The SRKII formula in the calculation of intraocular lens power.
abstract: This study compares the predictive accuracy of the SRKII formula for groups with average axial length and long eyes. 344 eyes which underwent cataract extraction with implantation of a posterior-chamber intraocular lens were included in the survey; 246 eyes had an average axial length (22.0-24.49 mm), and 98 eyes had an axial length of more than 24.50 mm. Mean absolute errors were 0.26+/-0.68 dpt in the first group and 1.16+/-1.78 dpt in the second group. 94.3% of the average eyes were within 1.0 dpt of the expected refraction, 98.8% within 2.0 dpt, whereas in the long-eye group 58.2% were within 1.0 dpt and 84.7% within 2.0 dpt. The results show that the SRKII formula performed credibly in average-length eyes; in the long eyes the ratio of large refractive deviations was greater than that of the other group.
authors.affiliation: Department of Ophthalmology, Ankara Hospital, Turkey.
authors.forename: A
authors.initials: A
authors.lastname: Nurözler
authors.forename: N
authors.initials: N
authors.lastname: Unlü
authors.forename: I S
authors.initials: IS
authors.lastname: Yalvaç
authors.forename: R
authors.initials: R
authors.lastname: Kasim
authors.forename: S
authors.initials: S
authors.lastname: Duman
mesh_terms: D001699:Biometry; D002387:Cataract Extraction; D005123:Eye / Q000033:anatomy & histology; D006801:Humans; D019654:Lens Implantation, Intraocular; D007910:Lenses, Intraocular; D008433:Mathematics; D055095:Optics and Photonics; D012029:Refraction, Ocular / Q000502:physiology*