Intraocular lens power calculations in short eyes using 7 formulas

Gökçe, Sabite Emine; Zeiter, John H.; Weikert, Mitchell P.; Koch, Douglas D.; Hill, Warren; Wang, Li

doi:10.1016/j.jcrs.2017.07.004

Cited by 94 publications

(73 citation statements)

References 16 publications

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“…Investigations in adualts showed that the Hoffer Q formula was more accurate compared to the SRK/T formula for eyes with AL <22 mm. A recent study did not detect any significant difference among the Barrett Universal II, Haigis, Hoffer Q, Holladay 1, Holladay 2, SRK/T and T2 for short eyes. As short eyes were the representative biometric index for paediatric eyes, we expect that formulas that generate the best prediction in short eyes would yield better refractive outcomes in paediatric cataracts.…”

Section: Discussionmentioning

confidence: 83%

Accuracy of intraocular lens power calculations in paediatric eyes

Liu

Wang

et al. 2020

Clinical Exper Ophthalmology

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Importance: There is no clear consensus on which intraocular lens (IOL) power calculation formula provides the best refractive prediction in the paediatric population.Background: To evaluate the predictability of desired postoperative refractive outcomes by using six IOL formulas in paediatric cataract cases.Design: Retrospective case series.Participants: A total of 377 eyes in 377 paediatric patients (<13 years of age) who received primary IOL implants in the capsular bag.Methods: This study utilized formulas, namely, SRK II, SRK/T, Hoffer Q, Holladay 1, T2 and Super formula. Prediction errors were calculated based on the difference between the postoperative refraction and the refraction predicted by each formula. Main Outcome Measures:The mean prediction error, mean absolute error, median absolute error, percentages of eyes within the prediction errors of ±0.50 D, ±1.00 D and ± 2.00 D.Results: The mean axial length was 22.48 ± 1.91 mm (<22.0 mm for 161 eyes). The average age at surgery was 55.21 ± 28.01 months (<24 months for 37 eyes).The mean prediction error was positive (hyperopic error) with all formulas.Compared to the other IOL power formulas, SRK II showed significantly higher absolute errors (P < .001). Hoffer Q and Holladay 1 generated the least absolute error, followed closely by Super formula. Multiple logistic analyses indicated that age at time of surgery was an independent factor significantly contributing to the refractive surprise using all formulas.

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Section: Discussionmentioning

confidence: 83%

Accuracy of intraocular lens power calculations in paediatric eyes

Liu

Wang

et al. 2020

Clinical Exper Ophthalmology

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“…Moreover, previous studies have reported that the Hoffer Q formula produced slightly myopic refractive errors. 12,51,52 Shrivastava and colleagues 52 reported that the Haigis formula produced slightly hyperopic refractive errors. The current findings agreed well with those reported previously.…”

Section: Accuracy Of Iol Power Calculations Accordingmentioning

confidence: 99%

Ratio of Axial Length to Corneal Radius in Japanese Patients and Accuracy of Intraocular Lens Power Calculation Based on Biometric Data

Omoto

Torii

Hayashi

et al. 2020

American Journal of Ophthalmology

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MIKI KAMIKAWATOKO OMOTO, HIDEMASA TORII, KEN HAYASHI, MASAHIKO AYAKI, KAZUO TSUBOTA, AND KAZUNO NEGISHI PURPOSE: To evaluate the features of the axial lengthto-corneal radius (AL/CR) ratio in Japanese patients with cataracts and to determine the accuracy of intraocular lens (IOL) power calculation formulas according to the AL/CR features and the axial length (AL).DESIGN: Retrospective observational case series. METHODS: Setting was a clinical practice. Patient population was a total of 1,135 eyes (1,135 patients) with cataracts. Observation procedures included measurement of the AL and corenal radius (CR) by optical biometry and evaluation of the refractive outcomes by using the SRK/T, Holladay 1, Hoffer Q, Haigis, and Barrett Universal II formulas. Main outcome measurements were the features of the AL/CR ratio and the accuracy of IOL power calculations based on the AL/CR ratio and the AL.RESULTS: The mean AL/CR ratio was 3.15 ± 0.19. Significant weak negative correlations were observed between the spherical equivalent (SE) and AL (r [ L0.7489; P < .001) and between the SE and AL/CR ratio (r [ L0.8069; P < .001); no correlation was found between the SE and CR (r [ 0.0208, P [ .483). For medium ALs and high AL/CR ratios, the SRK/T formula performed less accurately. For long ALs and high AL/CR ratios, the Holladay 1 and Hoffer Q formulas performed less accurately. The Barrett Universal II formula performed well across a range of ALs and AL/CR ratios. CONCLUSIONS: The AL/CR ratio explained the total variation in the SE better than the AL alone. Surgeons should pay attention to the selection of IOL power calculation formulas in eyes with high AL/CR ratios. (Am J Ophthalmol 2020;-:---. Ó

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“…No formula has yet been reported for calculating the IOL that is able to adapt to any eye type 15,[22][23][24][25][26][27] . As previously mentioned, ELP was estimated with the SRK/T formula based on the Pythagorean theorem with K data, and was calculated to be deeper in steep K and shallower in flat K 9 .…”

Section: Discussionmentioning

confidence: 99%

Development of a new intraocular lens power calculation method based on lens position estimated with optical coherence tomography

Satou

Shimizu

Tsunehiro

et al. 2020

Sci Rep

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A new method is developed and validated for intraocular lens (IOL) power calculation based on paraxial ray tracing of the postoperative IOL positions, which are obtained with the use of anterior segment optical coherence tomography. Of the 474 eyes studied, 137 and 337 were grouped into training and validation sets, respectively. The positions of the implanted IOLs of the training datasets were characterized with multiple linear regression analyses one month after the operations. A new regression formula was developed to predict the postoperative anterior chamber depth with the use of the stepwise analysis results. In the validation dataset, postoperative refractive values were calculated according to the paraxial ray tracing of the cornea and lens based on the assumption of finite structural thicknesses with separate surface curvatures. the predicted refraction error was calculated as the difference of the expected postoperative refraction from the spherical-equivalent objective refraction values. The percentage error (within ±0.50 diopters) of the new formula was 84.3%. This was not significantly correlated to the axial length or keratometry. The developed formula yielded excellent postoperative refraction predictions and could be applicable to eyes with abnormal proportions, such as steep or flat corneal curvatures and short and long axial lengths.open Scientific RepoRtS | (2020) 10:6501 | https://doi.org/10.1038/s41598-020-63546-ywww.nature.com/scientificreports www.nature.com/scientificreports/ previously reported the relationship between the crystalline lens parameter and the IOL position 18 . Goto et al. 19 developed a formula to predict postoperative ACD, including the angle-to-angle (ATA) depth obtained by presented a method to accurately estimate and quantify the entire shape of the crystalline lens from OCT data, and reported that the preoperative anterior segment parameters were exceptionally valuable for estimating the IOL position. Yoo et al. 17 reported improvements in refractive outcomes by the ray-tracing method using the equatorial plane position of the lens.Paraxial ray tracing repeats simple calculations without special software or complexity. The predictive accuracy of IOL power calculations with paraxial ray tracing including the IOL positions predicted by the AS-OCT has not been clarified.Correspondingly, the aims of the present study are a) the development of a new formula based on paraxial ray tracing for IOL power calculations that utilize the postoperative IOL positions obtained using AS-OCT, and b) the validation of the accuracy of the developed formula. Scientific RepoRtS |(2020) 10:6501 | https://doi.

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Intraocular lens power calculations in short eyes using 7 formulas

Cited by 94 publications

References 16 publications

Accuracy of intraocular lens power calculations in paediatric eyes

Accuracy of intraocular lens power calculations in paediatric eyes

Ratio of Axial Length to Corneal Radius in Japanese Patients and Accuracy of Intraocular Lens Power Calculation Based on Biometric Data

Development of a new intraocular lens power calculation method based on lens position estimated with optical coherence tomography

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