The SRK regression formula in calculating the dioptric power of intraocular lenses.

Menezo, J.L.; Chaques, V; Harto, M

doi:10.1136/bjo.68.4.235

Cited by 15 publications

(7 citation statements)

References 5 publications

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“…On the other hand, about one-third of the eyes had unexpected postoperative ametropias > 2 l.OD, and about 10% of the cases deviated more than k 2.OD from the predicted refraction. These results were similar to or better than those published by Menezo et al (1984), Richards et al (1985), Hope-Ross & Mooney (1988) and Spitznas et al (1991), while better accuracies have been reported by among others Dang & Raj (1989) and Sanders et al (1990). However, bearing in mind the large number of doctors taking part in the pre-and postoperative examinations, a more optimal performance of the calculation formulas in the present study could not realistically be expected.…”

Section: Discussionsupporting

confidence: 86%

The refractive error after implantation of a posterior chamber intraocular lens

Høvding

Natvik

Sletteberg

1994

Acta Ophthalmologica

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The study included 188 patients, in which a posterior chamber intraocular lens was implanted after extracapsular cataract extraction. After modifications of the intraocular lens constants (SRK formula and SRK II formula) and correction of the axial length measurements (Colenbrander-Hoffer formula) had been made, the mean differences between the actual postoperative spherical equivalent and that predicted by the three formulas were -0.23D, -0.22D and -0.46D, respectively. More than +/-1.0D deviation from the predicted postoperative refraction occurred in about one-third of the cases. Inter-observed discrepancy regarding the accuracy of the preoperative measurement of the ocular axis length is suggested to be the main cause of unpredicted postoperative refractive errors.

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Section: Discussionsupporting

confidence: 86%

The refractive error after implantation of a posterior chamber intraocular lens

Høvding

Natvik

Sletteberg

1994

Acta Ophthalmologica

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“…The regression formulas, especially the SRK one, are the ones widely used in calculat ing the power of IOL [14][15][16]. In our series, the regression formulas (SRK, DKG and Axt) have proved to be more accurate than the the oretical formulas, with good average devia tions, small maximum deviations, and the greatest percentage of cases with a predictive error within 1.0 dptr.…”

Section: Discussionmentioning

confidence: 86%

A Comparative Study of Eight Intraocular Lens Calculation Formulas

Ascaso¹,

Castillo²,

Cristobal³

et al. 1991

Ophthalmologica

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A retrospective study of 183 eyes that had undergonen extracapsular cataract extraction and posterior chamber intraocular lens (IOL) implantation was undertaken to compare the accuracy of eight IOL power calculation formulas (modified Binkhorst, Colenbrander, Gullstrand, Fyodorov-Galin-Linksz, Gill, Axt, Donzis-Kastle-Gordon and SRK regression). We found that the regression formulas were more accurate than the theoretical formulas, giving enough approximation to the ideal IOL as to assure its clinical use. We prefer the SRK formula because it is easier and it has a constant A that can be adapted in a personalized way to each surgical team.

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“…In the second part of this study of anterior chamber implants we focused our attention on the empirical SRK formulas (SRK and SRK II) mainly because they are highly accurate, widely utilised, and their 'A' constants can be readily optimised unlike the constants used by the theoretical formulas.`1 3-17 [21][22][23][24][25][26][27][28] We did not evaluate the recently developed SRK/T formula'9 which is a combination of the empirical and theoretical approaches because (i) at present it is neither readily available nor widely used, (ii) it was not superior to the more commonly used SRK II formula except in eyes of axial length >28-4 mm,9 and eyes of this axial length were not encountered in this study population.…”

Section: Discussionmentioning

confidence: 99%

Calculation of the power of anterior chamber implants.

Villada¹,

Raj²,

Akingbehin³

1992

British Journal of Ophthalmology

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Several formulas are available for calculating intraocular lens (IOL) power. Theoretical'-3 formulas were used in the initial stages followed by the development of more accurate empirical"7 formulas. The two commonly used theoretical formulas are the Binkhorst II8 and Colenbrander-Hoffer9 but the Sanders-RetzlaffKraff or SRK regression formula7 is presently the most commonly used IOL power calculation formula and this has recently been modified (SRK II)'°to take into account the non-linear relationship between axial length and IOL power. The predictive accuracy of the newly described SRK II formula was better than the original SRK formula in posterior chamber IOLs.'0" In anterior chamber IOLs, however, the SRK II formula was found to be less accurate than the original SRK formula and both of them were less accurate than the Binkhorst II formula.'2 A literature search revealed only a limited number of studies on the performance of various IOL power calculation formulas in anterior chamber IOLs.The use of optimised, rather than manufacturer recommended, constants has been reported to improve the predictive accuracy of the empirical SRK and SRK II formulas in posterior chamber lens implantation.'0" [13][14][15][16][17]

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The SRK regression formula in calculating the dioptric power of intraocular lenses.

Cited by 15 publications

References 5 publications

The refractive error after implantation of a posterior chamber intraocular lens

The refractive error after implantation of a posterior chamber intraocular lens

A Comparative Study of Eight Intraocular Lens Calculation Formulas

Calculation of the power of anterior chamber implants.

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