Intraocular lens power calculation after myopic excimer laser surgery: Clinical comparison of published methods

Giacomo Savini, Kenneth J. Hoffer, Michele Carbonelli, Piero Barboni

Research output: Contribution to journalArticlepeer-review


Purpose: To compare results of intraocular lens (IOL) power calculation methods after myopic excimer laser surgery. Setting: Private practice. Methods: In this prospective study, eyes having phacoemulsification after myopic excimer laser surgery were classified into Group 1 (preoperative corneal power available, refractive change known), Group 2 (preoperative corneal power available, refractive change uncertain), and Group 3 (preoperative corneal power unavailable, refractive change known even if uncertain). The IOL power was calculated using the following methods: clinical history, Awwad, Camellin/Calossi, Diehl, Feiz, Ferrara, Latkany, Masket, Rosa, Savini, Shammas, Seitz/Speicher, and Seitz/Speicher/Savini. Results: The lowest mean absolute errors (MAEs) in IOL power prediction in Group 1 (n = 12) and Group 2 (n = 11), respectively, were with the methods of Seitz/Speicher/Savini (0.51 diopter [D] ± 0.44 [SD] and 0.55 ± 0.50 D), Seitz/Speicher (0.58 ± 0.47 D and 0.54 ± 0.45 D), Savini (0.60 ± 0.44 D and 0.65 ± 0.63 D), Masket (0.82 ± 0.49 D and 0.69 ± 0.51 D), and Shammas (0.77 ± 0.43 D and 1.11 ± 0.50 D). In Group 3 (n = 5), the lowest MAEs were with the methods of Masket (0.23 ± 0.27 D), Savini (0.49 ± 0.86 D), Seitz/Speicher/Savini (0.68 ± 0.36 D), Shammas (0.84 ± 0.98 D), and Camellin/Calossi (0.91 ± 0.84 D). Conclusions: When corneal power is known, the Seitz/Speicher method (with or without Savini adjustment) seems the best solution to obtain an accurate IOL power prediction. Otherwise, the Masket method may be the most reliable option. Financial Disclosure: No author has a financial or proprietary interest in any material or method mentioned.

Original languageEnglish
Pages (from-to)1455-1465
Number of pages11
JournalJournal of Cataract and Refractive Surgery
Issue number9
Publication statusPublished - Sep 2010

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Surgery
  • Medicine(all)

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