Intraocular lens power calculation after two different successive corneal refractive surgeries

Zeng, Zongsheng; Ye, Xiangyu; Chen, Qingzhong; Jia, Changkai; Zhang, Guangbin

doi:10.1016/j.ajoc.2022.101547

Cited by 2 publications

(2 citation statements)

References 20 publications

(34 reference statements)

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“…Two of these papers were case reports, both of which cited the challenge of calculating the IOL in patients undergoing successive refractive surgeries. 19 , 20 The third paper was a consultation in the Journal of Cataract and Refractive Surgery (JCRS) asking the professional community which formula to utilize in this unique patient. 21 Physicians' responses varied but included 3C, Panacea, Barrett Universal II, and Holladay.…”

Section: Discussionmentioning

confidence: 99%

Precision in IOL Calculation for Cataract Patients with Prior History of Combined RK and LASIK Histories

Moshirfar,

Ayesha,

Jaafar

et al. 2024

OPTH

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Purpose This study aimed to evaluate the accuracy of 12 intraocular lens (IOL) power calculation formulae for eyes that have undergone both radial keratotomy (RK) and laser assisted in situ keratomileusis (LASIK) surgery to determine the efficacy of various IOL calculations for this unique patient group. Currently, research on this surgical topic is limited. Methods In this retrospective study, 11 eyes from 7 individuals with a history of RK and LASIK who underwent cataract surgery at Hoopes Vision were analyzed. Preoperative biometric and corneal topographic measurements were performed. Subjective refraction was obtained postoperatively. Twelve different intraocular lens (IOL) power calculations were used: Barrett True K No History, Barrett True K (prior LASIK, Prior RK history), Barrett Universal 2, Camellin-Calossi-Camellin (3C), Double K-Modified Holladay, Haigis-L, Galilei, OCT, PEARL-DGS, Potvin-Hill, Panacea, and Shammas. Results The rankings of mean arithmetic error (MAE), from least to greatest, were as follows: 3C (0.088), Haigis-L-L (−0.508), Shammas (−0.516), OCT Average (−0.538), Barrett True K (−0.557), OCT RK (−0.563), Galilei (−0.570), IOL Master (−0.571), OCT LASIK (−0.583), Barrett True K No History (−0.597), Pearl-DGS (−0.606), Potvin-Hill SF (−0.770), Potvin-Hill TNP (−0.778), Panacea (−0.876), and Barrett Universal 2 (−1.522). The 3C formula achieved the greatest percentage of eyes within ±0.25 D of target range (91%), while Haigis-L, Shammas, Galilei, Potvin Hill, Barrett True K, IOL Master, PEARL-DGS, and OCT formulae performed similarly, achieving 45% of eyes within ±0.75D of target refraction. Conclusion This study demonstrates the accuracy of the lesser known 3C formula in IOL calculation, particularly for patients who have undergone both RK and LASIK. Well-known formulae, such as Haigis-L, Shammas, and Galilei, which are used by the American Society of Cataract and Refractive Surgery (ASCRS), are viable options, although 3C formulae should be considered in this patient population. Furthermore, larger studies can confirm the best IOL power formulas for post-RK and LASIK cataract patients.

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Section: Discussionmentioning

confidence: 99%

Precision in IOL Calculation for Cataract Patients with Prior History of Combined RK and LASIK Histories

Moshirfar,

Ayesha,

Jaafar

et al. 2024

OPTH

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“…For example, a flattened cornea causes a falsely shallow ELP, resulting in an insufficient IOL power and a hyperopic shift after surgery. This error might be avoided by using formulas that do not use the corneal power to infer the ELP, such as the Haigis-L and Shammas formulas (39,40). Rosa et al proposed a further advanced lens measurement approach that combines the R factor and AL × K (AL × mean keratometry) methods for post-CRS IOL power calculation with unknown preoperative parameters, and 79.41% of eyes had a refractive error of <1 D (41)(42)(43).…”

Section: Management Of Refractive Surprisesmentioning

confidence: 99%

Challenges of refractive cataract surgery in the era of myopia epidemic: a mini-review

Du,

Meng,

et al. 2023

Front. Med.

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Myopia is the leading cause of visual impairment in the world. With ever-increasing prevalence in these years, it creates an alarming global epidemic. In addition to the difficulty in seeing distant objects, myopia also increases the risk of cataract and advances its onset, greatly affecting the productivity of myopes of working age. Cataract management in myopic eyes, especially highly myopic eyes is originally more complicated than that in normal eyes, whereas the growing population of cataract with myopia, increasing popularity of corneal and lens based refractive surgery, and rising demand for spectacle independence after cataract surgery all further pose unprecedented challenges to ophthalmologists. Previous history of corneal refractive surgery and existence of implantable collamer lens will both affect the accuracy of biometry including measurement of corneal curvature and axial length before cataract surgery, which may result in larger intraocular lens (IOL) power prediction errors and a compromise in the surgical outcome especially in a refractive cataract surgery. A prudent choice of formula for cataract patients with different characteristics is essential in improving this condition. Besides, the characteristics of myopic eyes might affect the long-term stability of IOL, which is important for the maintenance of visual outcomes especially after the implantation of premium IOLs, thus a proper selection of IOL accordingly is crucial. In this mini-review, we provide an overview of the impact of myopia epidemic on treatment for cataract and to discuss new challenges that surgeons may encounter in the foreseeable future when planning refractive cataract surgery for myopic patients.

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Intraocular lens power calculation after two different successive corneal refractive surgeries

Cited by 2 publications

References 20 publications

Precision in IOL Calculation for Cataract Patients with Prior History of Combined RK and LASIK Histories

Precision in IOL Calculation for Cataract Patients with Prior History of Combined RK and LASIK Histories

Challenges of refractive cataract surgery in the era of myopia epidemic: a mini-review

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