Effect of anterior chamber depth on the choice of intraocular lens calculation formula in patients with normal axial length

In standard cataract surgery, one of the major goals is to reach target refraction. Based on keratometry measurements, axial length and anterior chamber depth, most of the intraocular lens calculation formulae are suitable to achieve this aim. Further evaluation of corneal refractive parameters like anterior and posterior corneal surface by Scheimpflug devices led to a significant enhancement of precision in astigmatic and post-refractive surgery cases.

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Quantitative biometric cutoffs for the choice of the intraocular lens power calculation formula for a recently introduced nondiffractive extended depth-of-focus intraocular lens

European Journal of Ophthalmology ◽

10.1177/11206721211065551 ◽

2021 ◽

pp. 112067212110655

Author(s):

Alessandro Arrigo ◽

Gianpiera Gambaro ◽

Francesco Fasce ◽

Emanuela Aragona ◽

Innocente Figini ◽

...

Keyword(s):

Anterior Chamber ◽

Intraocular Lens ◽

Axial Length ◽

Anterior Chamber Depth ◽

Power Calculation ◽

Calculation Formula ◽

Intraocular Lens Power Calculation ◽

Intraocular Lens Power ◽

Lens Power ◽

Lens Power Calculation

Purpose This study aimed to analyze biometry values cutoffs for the choice of the best intraocular lens power calculation formula for AcrySof IQ Vivity intraocular lens. Methods The study was designed as interventional case series with 3 months of follow-up. Intraocular lens power calculation formulas included Barrett Universal II and SRK/T. The first was adopted for the intraocular lens power choice. The quantitative analysis focused on the identification of specific biometric cutoffs considering axial length, anterior chamber depth, and corneal powers. We included only the dominant eye in the statistical analysis. Results One hundred and eight eyes of 54 patients (23 males; mean age 62 ± 5 years) with no ocular diseases were included. Best-corrected visual acuity improved from 0.3 ± 0.2 to 0.0 ± 0.0 logMAR. All the eyes reached spectacles-free far and intermediate visions; a spherical addition of + 1.0D was necessary to adjust near vision. We identified significant quantitative cutoffs based on axial length and anterior chamber depth. Barrett Universal II resulted the best formula for eyes disclosing an axial length >25 mm, whereas SRK/T turned out to be the best choice for the eyes characterized by an anterior chamber depth <2.8 mm. Our analysis disclosed an overall sensitivity of 0.8 and a specificity of 0.7 ( p < 0.01). Conclusions Axial length and anterior chamber depth influence the choice of Barrett Universal II and SRK/T formulas. Quantitative biometric cutoffs may be useful to discriminate the best formula to be adopted.

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Lenstar® LS 900 vs Pentacam®-AXL: Comparative study of ocular biometric measurements and intraocular lens power calculation

European Journal of Ophthalmology ◽

10.1177/1120672118771844 ◽

2018 ◽

Vol 28 (6) ◽

pp. 645-651 ◽

Cited By ~ 4

Author(s):

Joana Maria Mendes Pereira ◽

Arminda Neves ◽

Pedro Alfaiate ◽

Mónica Santos ◽

Henrique Aragão ◽

...

Keyword(s):

Anterior Chamber ◽

Intraocular Lens ◽

Axial Length ◽

Central Corneal Thickness ◽

Corneal Thickness ◽

Anterior Chamber Depth ◽

T Test ◽

Biometric Measurements ◽

Paired T Test ◽

Intraocular Lens Calculation

Purpose: Comparison of biometric measurements and calculation of intraocular lens with a new biometer (Pentacam®-AXL, Oculus, Germany) and a reference biometer (Lenstar LS 900®, Haag-Streit AG, Switzerland), in order to assess the agreement between these two devices. Setting: Centro Hospitalar de Leiria, Portugal Materials and methods: Prospective, institutional study, in which measurements of axial length, anterior chamber depth from the corneal epithelium and endothelium to the anterior surface of the lens (anterior chamber depth ext and anterior chamber depth int), central corneal thickness and keratometry readings of the flattest and steepest meridians (K1 and K2) were obtained with the two systems. Intraocular lens calculation was also performed, using the Haigis, SRK/T and HofferQ formulas. Results: The study sample included 136 eyes of 79 patients. Of these, 42 were women and 37 were men. Statistically significant differences were found (p < 0.05, paired T test) in K1, K2 and central corneal thickness between the 2 biometers. Intraocular lens calculation with the Lenstar® and the Pentacam® with Haigis, SRK/T and HofferQ formulas showed statistically significant differences (p < 0.05 Paired T test). Conclusion: Axial length measurements obtained with the Pentacam® and Lenstar® appear to be interchangeable, while measurements of anterior chamber depth, K1 and K2, and central corneal thickness do not appear to be interchangeable between different devices. Statistically significant differences were found in the calculation of intraocular lenses in all formulas used.

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Comparison of axial length, anterior chamber depth and intraocular lens power between IOLMaster and ultrasound in normal, long and short eyes

PLoS ONE ◽

10.1371/journal.pone.0194273 ◽

2018 ◽

Vol 13 (3) ◽

pp. e0194273 ◽

Cited By ~ 1

Author(s):

Jing Dong ◽

Yaqin Zhang ◽

Haining Zhang ◽

Zhijie Jia ◽

Suhua Zhang ◽

...

Keyword(s):

Anterior Chamber ◽

Intraocular Lens ◽

Axial Length ◽

Anterior Chamber Depth ◽

Intraocular Lens Power ◽

Lens Power

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Effects of Anterior Chamber Depth and Axial Length on Refractive Error after Intraocular Lens Implantation

Journal of the Korean Ophthalmological Society ◽

10.3341/jkos.2010.51.2.195 ◽

2010 ◽

Vol 51 (2) ◽

pp. 195 ◽

Cited By ~ 17

Author(s):

Hyo-Sung Maeng ◽

Eun Hye Ryu ◽

Tae-Young Chung ◽

Eui-Sang Chung

Keyword(s):

Anterior Chamber ◽

Intraocular Lens ◽

Refractive Error ◽

Axial Length ◽

Anterior Chamber Depth ◽

Intraocular Lens Implantation ◽

Lens Implantation

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Accuracy of 8 intraocular lens calculation formulas in relation to anterior chamber depth in patients with normal axial lengths

Journal of Cataract & Refractive Surgery ◽

10.1016/j.jcrs.2018.01.015 ◽

2018 ◽

Vol 44 (3) ◽

pp. 362-368 ◽

Cited By ~ 12

Author(s):

Sabite Emine Gökce ◽

Ildamaris Montes De Oca ◽

David L. Cooke ◽

Li Wang ◽

Douglas D. Koch ◽

...

Keyword(s):

Anterior Chamber ◽

Intraocular Lens ◽

Anterior Chamber Depth ◽

Intraocular Lens Calculation

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Refractive Error Induced by Intraocular Lens Tilt After Intrascleral Intraocular Lens Fixation

10.21203/rs.3.rs-192757/v1 ◽

2021 ◽

Author(s):

TERUAKI TOKUHISA ◽

TOMOYUKI WATANABE ◽

AKIRA WATANABE ◽

TADASHI NAKANO

Keyword(s):

Anterior Chamber ◽

Intraocular Lens ◽

Refractive Error ◽

Axial Length ◽

Optical Design ◽

Anterior Segment ◽

Anterior Chamber Depth ◽

Design Program ◽

Department Of Ophthalmology ◽

Postoperative Anterior Chamber Depth

Abstract Purpose To investigate the spherical shift of Intraocular lens (IOL) tilt after intrascleral fixationMethods We retrospectively reviewed the medical records of patients who underwent flanged intrascleral IOL fixation with transconjunctival 25- or 27-gauge pars plana vitrectomy at the Department of Ophthalmology of Jikei University Hospital with a minimum follow-up duration of three months. Second-generation anterior segment optical coherence tomography (CASIA2; TOMEY) was used to obtain the tilt and decentration of intrasclerally fixated IOL and postoperative anterior chamber depth. We investigated the relationship of the refractive error with these parameters, axial length, and keratometry. In addition to the clinical investigation, we performed optical simulations using the Zemax optical design program for studying the spherical shift of the IOL tilt by means of the through-focus response and change of spherical equivalent power.Results The study involved 72 eyes of 67 patients. The degree of IOL tilt was correlated with the amount of refractive error (Spearman's rank correlation coefficient [CC] = −0.32; P = 0.006). In particular, a tilt angle greater than 10° strongly influenced the refractive error. Postoperative anterior chamber depth also correlated with the refractive error (CC = 0.50; P < 0.001). The refractive error did not correlate with decentration (CC = −0.17; P = 0.15), axial length (CC = −0.08; P = 0.49), and keratometry (CC = −0.06; P =0.64). Optical simulations using the Zemax optical design program also showed a myopic shift exponentially as the tilt becomes greater. Conclusion An IOL tilt greater than 10 ° induces refractive error.

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