PMID: 16619803Apr 20, 2006Paper

Accuracy of the SRK II, SRK/T, Holladay and Hoffer Q IOL power calculation formulas in hyperopic patients after phacoemulsification

Klinika oczna
Jerzy SzaflikAnna Jedruch

Abstract

Comparison of the SRK II, SRK/T, Holladay and Hoffer Q formulas accuracy, in calculating IOL power in hyperopic patients. 34 eyes of 22 hyperopic patients, 15 women and 7 men, at the age from 19 to 85 years old, after phacoemulsification with PCIOL implantation, operated between 1998 and 2004 were analysed retrospectively. The power of IOL was calculated using the SRK/T formula and ranged from 28.5 to 35.0 D. The axial length ranged from 19.6 mm to 21.99 mm. The obtained refraction was measured with autorefractometer from 9 days to 37 month after operation, mean 6 month. In addition, the theoretical target refraction for the implanted IOL was calculated using the SRK II, Holladay and Hoffer Q formulas and the differences between the target and obtained refraction for all the formulas were compared. The best accuracy of IOL power calculation was obtained with the Hoffer Q formula. The Holladay, SRK/T and SRK II formulas gave worse results respectively. For the purpose of IOL power calculation in hyperopic patients the Hoffer Q or Holladay formula should be chosen from those mentioned above. Nevertheless, miscalculation exceeding 3D also happens in case of using them. The use of SRK II and SRK/T is not recommended. To improve the...Continue Reading

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