Clinical results in phacoemulsification using the SRK/T formula

Lagrasta, Juliana Marques de Souza; Allemann, Norma; Scapucin, Luciana; Moeller, Cecília Tobias de Aguiar; Ohkawara, Lilian E.; Melo, Luiz Alberto S.; Soriano, Eduardo; Casanova, Fábio Henrique Cacho

doi:10.1590/s0004-27492009000200011

Cited by 14 publications

(7 citation statements)

References 21 publications

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“…In the cataract alone group, a prediction error within ±0.5 D was found in 70.1% and a prediction error within ±1.0 D was found in 94.4%. Our outcomes were consistent with refractive error outcomes after cataract surgery alone in other studies that reported a prediction error within ±0.5 D in 55–75% of patients and a prediction error within ±1.0 D in 91–98% [15-18].…”

Section: Discussion/conclusionsupporting

confidence: 91%

Refractive Outcomes of Combined Cataract Surgery and Vitrectomy Compared to Cataract Surgery Alone

Kokame¹,

Tanji²,

Yanagihara³

et al. 2022

Ophthalmologica

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Purpose: To evaluate the refractive outcomes of combined cataract surgery and vitrectomy to cataract surgery alone. Methods: This retrospective chart review study included two groups – 1) combined surgery in 103 eyes (101 patients) who underwent cataract surgery with posterior chamber intraocular lens (PCIOL) placement by a single cataract surgeon and vitrectomy by a single vitreoretinal surgeon at the same surgical setting 2) cataract surgery alone by the same surgeon in 107 eyes (84 patients). Refractive outcomes and complications between the combined and cataract surgery alone group were compared. The predicted refractive error was compared to postoperative refractive outcomes in both groups, surgically induced astigmatism (SIA), intraoperative or postoperative complications of either cataract surgery or vitrectomy, and cystoid macular edema. Results: There was no statistically significant difference between predicted and actual postoperative refractive outcomes between the combined and cataract surgery alone groups (within ±0.5 diopters (D), P = 0.099; within ±1.0 D, P = 0.721). There was no difference in SIA refractive outcomes between the two groups (P = 0.509). The use of intraoperative gas for retina tamponade did not significantly affect postoperative refractive outcomes. Both cataract surgery and vitrectomy were successfully performed without unexpected complications from either procedure affecting the other. Discussion/Conclusion: Combined cataract surgery and vitrectomy allows excellent refractive outcomes equal to cataract surgery alone, allowing each procedure to be performed independently by separate anterior and posterior segment surgeons. Combined procedures can be performed in eyes with a variety of retinal indications and can include fluid-gas exchange with minimal risk of PCIOL malposition or change in targeted refraction.

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Section: Discussion/conclusionsupporting

confidence: 91%

Refractive Outcomes of Combined Cataract Surgery and Vitrectomy Compared to Cataract Surgery Alone

Kokame¹,

Tanji²,

Yanagihara³

et al. 2022

Ophthalmologica

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“…Lagrasta et al27 showed a prediction accuracy of 24% for refractive error within ±0.25D, 55% for refractive error within ±0.50D, and 91% for refractive error within ±1.00D using SRK/T formula with US biometry in 33 eyes of 33 patients with medium ALs (22.2–24.5 mm). The mean attempted predicted SE was −0.431±0.181D (range −0.02 to −0.72D), the mean achieved postoperative SE was −0.220±0.732D (range +1.75 to −1.625D), and the mean PE was 0.211±0.708D (range −1.07 to 2.33D).…”

Section: Discussionmentioning

confidence: 99%

Predicting the refractive outcome and accuracy of IOL power calculation after phacoemulsification using the SRK/T formula with ultrasound biometry in medium axial lengths

Karabela¹,

Eliacik²,

Kocabora³

et al. 2017

OPTH

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PurposeTo evaluate the accuracy of the SRK/T formula using ultrasound (US) biometry in predicting a target postoperative refraction of ±1.00D in eyes with medium axial length (AL) that underwent phacoemulsification.MethodsThe present study was a retrospective analysis, which included 538 eyes with an AL from 22.0 to 24.60 mm that underwent phacoemulsification and foldable intraocular lens (IOL) implantation (six different IOLs) in the bag. Preoperative AL was measured by US biometry and IOL power (IOLp) was calculated with the SRK/T formula. Patients had a complete ophthalmic examination, preoperatively and 1, 7, and 30 days after surgery. The achieved spherical equivalent (SE) and the prediction error (PE) were calculated. The prediction error was defined as the difference between attempted predicted target refraction and the achieved postoperative SE refraction. Statistical analysis was performed with SPSS V21.ResultsThe mean age of the patients was 66.96±9.67 years, the mean AL was 23.29±0.62 mm, the mean K1 was 43.62±1.49D, the mean K2 was 43.69±1.53D, the mean IOL power was 21.066±1.464D, the mean attempted (predicted) SE was −0.178±0.266D, and the mean achieved SE was −0.252±0.562D. The mean PE (difference between predicted and achieved SE) showed a relatively hyperopic shift (mean ± standard deviation: 0.074±0.542D, ranging from −1.855 to 2.170D, P=0.001). A total of 93.87% of eyes were within ±1.00D of the PE and 92.75% of eyes within ±1.00D of achieved postoperative refraction. A total of 39 eyes (7.25%) had a refractive surprise. A total of 32 of 39 eyes were more myopic than −1.00D and 7 of them were more hypermetropic than +1.00D. There was no correlation between the mean PE and IOL type, AL, K1, K2, and IOLp. There were a positive statistically significant correlation between PE and age (r=0.095; P=0.028) and a negative statistically significant correlation between achieved SE and AL (Spearman’s r=−0.125; P=0.04), and age (r=−0.141; P=0.01).ConclusionThe IOLp calculation using the SRK/T formula with US biometry may demonstrate very good postoperative refractive outcomes in medium eyes with a few refractive surprises.

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“…16 Studies of the accuracy of IOL calculations number more than 20 in 2007 to 2009 alone. [17][18][19][20] Although third-and fourth-generation IOL calculation formulas are more accurate than the first and second generations, refractive surprises continue to occur due to variables such as A-constants, AL, and previous corneal refractive surgery. [20][21][22][23] In a study by Haigis et al, 24 the postoperative refraction was predicted correctly to within G1.00 D in 86% of cases and to within G2.00 D in 99% of cases using immersion biometry data.…”

Section: Discussionmentioning

confidence: 99%

Combined correction of sphere and astigmatism using the light-adjustable intraocular lens in eyes with axial myopia

Hengerer¹,

Hütz²,

Dick³

et al. 2011

Journal of Cataract and Refractive Surgery

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Clinical results in phacoemulsification using the SRK/T formula

Abstract: The SRK/T formula demonstrated a satisfactory accuracy to calculate the error of refraction in eyes with medium axial length.

Cited by 14 publications

References 21 publications

Refractive Outcomes of Combined Cataract Surgery and Vitrectomy Compared to Cataract Surgery Alone

Refractive Outcomes of Combined Cataract Surgery and Vitrectomy Compared to Cataract Surgery Alone

Predicting the refractive outcome and accuracy of IOL power calculation after phacoemulsification using the SRK/T formula with ultrasound biometry in medium axial lengths

Combined correction of sphere and astigmatism using the light-adjustable intraocular lens in eyes with axial myopia

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