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Seitz/Speicher method reliable for IOL power calculation when corneal power is known
J Cataract Refract Surg. 2010;36(9):1455-1465.
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The Seitz/Speicher method, with or without the Savini modification, provides the most accurate IOL calculation when corneal power or refractive changes are known, according to a prospective study.
Researchers analyzed 28 eyes of 27 patients who underwent phacoemulsification after myopic excimer laser surgery. Specifically, group one included 12 eyes with known corneal and refractive power, group two included 11 eyes with known corneal power but uncertain refractive power, and group three included five eyes with unknown corneal power and known refractive change.
The investigators found that IOL power calculations using the Seitz/Speicher and Savini methods yielded the lowest mean absolute errors among eyes in groups one and two, according to the study.
The Masket and Shammas no-history methods could also be relied on in these groups, the study said.
Among the five eyes with unknown corneal power and known refractive change, the lowest mean absolute errors were found using the Masket and Savini methods, according to the study
"Good results can also be achieved by entering the corneal power of the Camellin/Calossi and Awwad methods into the double-K Holladay 1 formula," the study authors said. "When data concerning the preoperative corneal power are lacking but the refractive change is known, the same methods still provide the best outcomes in IOL power prediction."