&lt;p&gt;How Can We Improve Toric Intraocular Lens Calculation Methods? Current Insights&lt;/p&gt;

Ferreira, Tiago B; Ribeiro, Filomena

doi:10.2147/opth.s238686

Cited by 13 publications

(14 citation statements)

References 52 publications

(65 reference statements)

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“…3 However, patients who have undergone prior refractive surgery and those who require toric IOL correction or incisional keratotomy may require additional calculations performed with special formulas, such as the Barrett True K or the Barrett Toric Formula, and these formulas do not uniformly reside on biometry machines, necessitating transfer of the data to a separate system for surgical planning. 4 This transfer of data introduces the possibility of transcription errors and consumes significant time. Considering that errors in transcribing numbers from one platform to another are possible, manual transcription of information critical to the refractive outcome is certainly not ideal.…”

Section: Video Abstractmentioning

confidence: 99%

Cataract Surgical Planning Using Online Software vs Traditional Methods: A Time/Motion and Quality of Care Study

Gujral¹,

Hovanesian²

2021

OPTH

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The objective of this study is to compare two methods of preoperative planning for placement of intraocular implants: traditional paper documentation/electronic scans versus a novel online planning software. The aim was to compare the time required and number of data points manually transcribed with each method and to explore whether differences in surgical accuracy could be identified between the two methods in a small sample of 40 patients. Methods: In this study, preoperative planning was performed twice for all enrolled patients: once through the traditional method and once using an online planning software system. The total time spent and number of data points manually transferred were recorded for each method. Results: Of the 40 patients enrolled, the mean total surgical planning time was 239 ± 190 seconds for the traditional method vs 63 ± 31 seconds with the online planning software (P<0.00001). The mean number of data points transcribed was 7.2 ± 7.2 for the traditional method vs 0.9 ± 1.7 with the online planning software (P<0.0000001). No statistically significant differences were noted in terms of accuracy of prediction of the spherical equivalent surgical outcome. Conclusion:In comparison to traditional methods, a significant reduction in time required for surgical planning and the manual transcription of data points was noted when a comprehensive online surgical planning software was used. This has important implications for the efficiency and likely the safety of surgical planning.

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Section: Video Abstractmentioning

confidence: 99%

Cataract Surgical Planning Using Online Software vs Traditional Methods: A Time/Motion and Quality of Care Study

Gujral¹,

Hovanesian²

2021

OPTH

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“…Previous studies showed that using traditional formulas will bring only 26–35% of eyes to within 0.5D of the targeted astigmatism in regular corneas 37 , with a post-operative residual astigmatism of − 0.64 ± 0.43D 15 , − 0.71 ± 0.43D 16 and − 1.03 ± 0.79D 38 . Other studies described that IOL power calculation is considerably less accurate in keratoconus than in typical eyes 17 , 18 , 30 .…”

Section: Discussionmentioning

confidence: 99%

Ray tracing optimization: a new method for intraocular lens power calculation in regular and irregular corneas

Pérez-Merino

Aramberri²,

Quintero

et al. 2023

Sci Rep

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To develop a novel algorithm based on ray tracing, simulated visual performance and through-focus optimization for an accurate intraocular lens (IOL) power calculation. Custom-developed algorithms for ray tracing optimization (RTO) were used to combine the natural corneal higher-order aberrations (HOAs) with multiple sphero-cylindrical corrections in 210 higher order statistical eye models for developing keratoconus. The magnitude of defocus and astigmatism producing the maximum Visual Strehl was considered as the optimal sphero-cylindrical target for IOL power calculation. Corneal astigmatism and the RMS HOAs ranged from − 0.64 ± 0.35D and 0.10 ± 0.04 μm (0-months) to − 3.15 ± 1.38D and 0.82 ± 0.47 μm (120-months). Defocus and astigmatism target was close to neutral for eyes with low amount of HOAs (0 and 12-months), where 91.66% of eyes agreed within ± 0.50D in IOL power calculation (RTO vs. SRK/T). However, corneas with higher amounts of HOAs presented greater visual improvement with an optimized target. In these eyes (24- to 120-months), only 18.05% of eyes agreed within ± 0.50D (RTO vs. SRK/T). The power difference exceeded 3D in 42.2% while the cylinder required adjustments larger than 3D in 18.4% of the cases. Certain amounts of lower and HOAs may interact favourably to improve visual performance, shifting therefore the refractive target for IOL power calculation.

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“…In our study group, mean change in corneal astigmatism was 0.28 D. This change is in line with the previous publications reporting corneal astigmatism change of 0.1 to 0.3 in a standard phacoemulsification cataract surgery with a 2.4 mm corneal incision. 30,31 In terms of visual acuity outcomes, previous studies investigating long-term outcomes in eyes with AC IOL report CDVA of 20/64 to 20/60 at final follow-up. 15,32,33 With the presented technique, CDVA results were noninferior (20/70-20/40) to those previously reported.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Modification of intraocular lens insertion using 4-flanged fixation with a standard cartridge and a 2.4 mm corneal incision in eyes with no capsular support

Mahler

Einan‐Lifshitz

Hecht

et al. 2021

J Cataract Refract Surg

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A modification of intraocular lens (IOL) implantation, using the 4-flanged IOL fixation technique, through a 2.4 mm corneal incision using a standard cartridge and injector, is presented. An IOL with 4 eyelets is used, through which a 6-0 polypropylene suture is threaded on one side and then loaded into a provided cartridge and inserted to the anterior chamber through a 2.4 mm corneal incision. Using the handshake technique, the suture ends are eventually threaded through the eyelets and secured outside the eye with the creation of 4 flanges. This technique was used in 6 eyes of 5 consecutive patients with the absence of capsular support. During all follow-up visits, the IOLs were well centered and stable, and the flanges were buried in the sclera and covered with the conjunctiva. No complications were recorded. This modification simplifies the technique and reduces the well-known complications of large corneal incisions.

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<p>How Can We Improve Toric Intraocular Lens Calculation Methods? Current Insights</p>

Cited by 13 publications

References 52 publications

Cataract Surgical Planning Using Online Software vs Traditional Methods: A Time/Motion and Quality of Care Study

Cataract Surgical Planning Using Online Software vs Traditional Methods: A Time/Motion and Quality of Care Study

Ray tracing optimization: a new method for intraocular lens power calculation in regular and irregular corneas

Modification of intraocular lens insertion using 4-flanged fixation with a standard cartridge and a 2.4 mm corneal incision in eyes with no capsular support

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