Accuracy of formulae for secondary intraocular lens power calculations in pediatric aphakia

Nakhli, Fouad R.; Emarah, Khaled; Jeddawi, Laila

doi:10.1016/j.joco.2017.05.007

Cited by 10 publications

(16 citation statements)

References 13 publications

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“…SRK II formula has been recommended [ 123 ] but SRK/T and Holladay II formulae showed least predictive error in a series of 117 eyes that included eyes <20 mm axial length [ 124 ]. Thirty-one children with secondary IOL under 3.6 years were found to have the least median absolute error with SRK II, SRK/T and Holladay I (1.23–1.30D) [ 125 ]. IOL master was deemed more accurate than contact biometry method under general anaesthetic (1.80 ± 1.40D vs. 2.43 ± 1.83D; p = 0.01) [ 123 ].…”

Section: Correction Of Paediatric Aphakia Using Iolsmentioning

confidence: 99%

Cataract management in children: a review of the literature and current practice across five large UK centres

Self

Taylor

Solebo

et al. 2020

Eye

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Congenital and childhood cataracts are uncommon but regularly seen in the clinics of most paediatric ophthalmology teams in the UK. They are often associated with profound visual loss and a large proportion have a genetic aetiology, some with significant extra-ocular comorbidities. Optimal diagnosis and treatment typically require close collaboration within multidisciplinary teams. Surgery remains the mainstay of treatment. A variety of surgical techniques, timings of intervention and options for optical correction have been advocated making management seem complex for those seeing affected children infrequently. This paper summarises the proceedings of two recent RCOphth paediatric cataract study days, provides a literature review and describes the current UK 'state of play' in the management of paediatric cataracts.

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Section: Correction Of Paediatric Aphakia Using Iolsmentioning

confidence: 99%

Cataract management in children: a review of the literature and current practice across five large UK centres

Self

Taylor

Solebo

et al. 2020

Eye

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“…The sutureless corneal incision was further reinforced with ReSure sealent since the Intacs ring was very close to the incision. The patient was further refracted on day one and one-week post-op to determine the stability of refraction and using the secondary lens implant formula we determine a toric implant of SN6AT4 lens implant which was placed in the prepared capsular bag and aligned to the determined axis [5,6]. The endpoint of this process led the patient to see 20/20 without glasses and he was ecstatic at his outcome especially given the brief and staged techniques albeit in the right direction of the future anyways (Cataract surgery).…”

Section: Discussionmentioning

confidence: 99%

“…So, in the case of this patient, an outside-in approach was used where the scar and irregularity of the cornea were improved to make the cornea measurable followed by a lens implant into the aphakic eye to reach emmetropia ( Figure 1 So, his aphakic eye was refracted on day one and week one post-op to a consistent measurement at +4.75, -1.50 x 165 to 20/30. We multiplied this spherical equivalent by a factor of 1.5 following the piggyback intraocular lens (IOL) formula to eventually go with full confidence with a Toric lens implant aiming straight for emmetropia [5,6].…”

Section: Case Presentationmentioning

confidence: 99%

“…So, his aphakic eye was refracted on day one and week one post-op to a consistent measurement at +4.75, -1.50 x 165 to 20/30. We multiplied this spherical equivalent by a factor of 1.5 following the piggyback intraocular lens (IOL) formula to eventually go with full confidence with a Toric lens implant aiming straight for emmetropia [ 5 , 6 ].…”

Section: Case Presentationmentioning

confidence: 99%

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Staged Cataract Post Scar Removal: A Case Report

Gulani

Gulani²

2020

Cureus

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A 62-year-old white Caucasian male was referred with Keratoconus and posterior subcapsular cataract (PSC) and a history of 12 previous procedures including implantable contact lens surgery (ICL), Intacs corneal implant, Cross Linking, Phototherapeutic Keratectomy (PTK) and Photorefractive Keratectomy (PRK). All the procedures were surgically well done by his surgeon but resulted in 20/200 vision and an irregular, scarred cornea. After undergoing Laser Corneoplastique and a staged Cataract surgery, he was brought to unaided 20/20 vision in this eye.

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“…When IOL was implanted in the sulcus, IOL power was adjusted. For biometry-based formulae, this adjustment, respectively, reduced IOL power by 0.50 D for IOL range (9 D < IOL ≤17 D), 1.00 D for range (17 D < IOL ≤28 D), and 1.50 D for range (28 D > IOL) [4]. For AR-based formulae, to compensate sulcus placement, +0.52 D was subtracted from the target refraction error [2].…”

Section: Iol Power Calculationmentioning

confidence: 99%

Comparison of Aphakic Refraction and Biometry-Based Formulae for Secondary In-The-Bag and Sulcus-Implanted Intraocular Lens Power Estimation in Children

Zhang

Leng

et al. 2020

Ophthalmic Res

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Purpose: To compare the accuracy of refractive outcomes in children undergoing secondary in-the-bag or cilliary sulcus IOL implantation, using aphakic refraction (AR)-based formulae and biometry-based formulae. Methods: In this retrospective study, 39 eyes of the in-the-bag IOL group and the other 26 eyes of the sulcus-implanted IOL group. Holladay 1, Hoffer Q, SRK/T and SRK II formulae were employed depending on the biometric data, while Hug and Khan formulae were used based on preoperative aphakic refraction. The prediction error (PE) and the absolute value of predicted error (APE) were compared between the two groups and formulae. Results: In the in-the-bag IOL group, non-significant differences of APE were found among the 6 formulae, while the Holladay 1, Hoffer Q, SRK/T and SRK II all demonstrated a significant hyperopic shift of median PE value compared to the Hug formula and Holladay 1 and SRK II also showed a significant hyperopic shift of PE compared to the Khan . Higher percentages of eyes with PE less than 1 D were found using Hoffer Q and SRK/T. In the sulcus-implanted group, the Holladay 1, Hoffer Q and SRK/T had a significantly smaller median value of APE than the Hug and Khan formulae, and the SRK II had a significantly smaller median value of APE than the Hug formula, while Holladay 1 had the lowest value of APE. Higher percentages of eyes within PE less than 1 D were found using Holladay 1, Hoffer Q and SRK/T, while the highest was SRK/T. Significantly larger hyperopic shifts of median PE value using all the 6 formulae were found in eyes with sulcus-implanted IOL than with in-the-bag implanted IOL . In in-the-bag implanted IOL group, the Hug and Khan formulae had significantly smaller APE values when compared with the sulcus-implanted IOL group. Conclusions: whether IOL was in the bag or sulcus implantation, almost all the formulae showed hyperopic shift, SRK/T showed the best accuracy. Biometry-based formulae were superior to AR-based formulae in accuracy of IOL power calculation, especially when IOL was implanted in the sulcus. In-the-bag IOL implantation should always be with higher priorities, especially when using AR-based formulae in IOL power calculation.

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Accuracy of formulae for secondary intraocular lens power calculations in pediatric aphakia

Cited by 10 publications

References 13 publications

Cataract management in children: a review of the literature and current practice across five large UK centres

Cataract management in children: a review of the literature and current practice across five large UK centres

Staged Cataract Post Scar Removal: A Case Report

Comparison of Aphakic Refraction and Biometry-Based Formulae for Secondary In-The-Bag and Sulcus-Implanted Intraocular Lens Power Estimation in Children

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