Accuracy of Total Corneal Astigmatism Measurements With a Scheimpflug Imager and a Color Light-Emitting Diode Corneal Topographer

Klijn, Stijn; Reus, Nicolaas J.; Sommen, Charlotte M. van der; Sicam, Victor Arni D. P.

doi:10.1016/j.ajo.2016.04.011

Cited by 33 publications

(23 citation statements)

References 19 publications

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“…) and specular reflections (Klijn et al. ), measure keratometric astigmatism (KA) and posterior corneal astigmatism (PCA) separately. These methods may also provide a total corneal astigmatism (TCA), based on Snell′s law (Koch et al.…”

Section: Introductionmentioning

confidence: 99%

“…Newer technologies, such as Scheimpflug camera imaging (Koch et al 2012;Savini et al 2014;Tonn et al 2015;Naeser et al 2017), optical coherence tomography (Ueno et al 2014) and specular reflections (Klijn et al 2016), measure keratometric astigmatism (KA) and posterior corneal astigmatism (PCA) separately. These methods may also provide a total corneal astigmatism (TCA), based on Snell 0 s law (Koch et al 2012;Savini et al 2014;Tonn et al 2015;Klijn et al 2016;Fredriksson & Behndig 2017;Nae et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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Age‐related changes in with‐the‐rule and oblique corneal astigmatism

Næser

Savini

Bregnhøj

2018

Acta Ophthalmologica

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Corneal astigmatism is stable until the age of 50 years; thereafter both keratometric and total corneal astigmatism show a 0.25 D ATR change per 10 years. The average 0.25 D ATR PCA compensates the predominant keratometric WTR astigmatism in the younger patients and increases the TCA in the elderly with keratometric ATR astigmatism. The gender-based differences in age-related astigmatism require further studies.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Age‐related changes in with‐the‐rule and oblique corneal astigmatism

Næser

Savini

Bregnhøj

2018

Acta Ophthalmologica

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“…Additionally, toric calculators, such as Panacea IOL & Toric Calculator, consider real measurements of anterior and posterior toricity with the correction from keratometric to real corneal refractive index 42. Although the use of direct measurements of the anterior and posterior cornea is helpful in decreasing resultant astigmatism after toric IOL implantation,33,43,44 there are studies demonstrating that the outcomes achieved using these measurements or software are not better than those achieved with the Barrett’s toric calculator 24,45…”

Section: Resultsmentioning

confidence: 99%

<p>Consensus on the management of astigmatism in cataract surgery</p>

Núñez¹,

Henríquez²,

Escaf³

et al. 2019

OPTH

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This project was aimed at achieving consensus on the management of astigmatism during cataract surgery by ophthalmologists from Latin America using modified Delphi technique. Relevant peer-reviewed literature was identified, and 21 clinical research questions associated with the definition, classification, measurement, and treatment of astigmatism during cataract surgery were formulated. Twenty participants were divided into seven groups, and each group was assigned three questions to which they had to respond in written form, after thoroughly reviewing the literature. The assigned questions with corresponding responses by each group were discussed with other participants in round 4 – presentation of findings. The consensus was achieved if approval was obtained from at least 80% of participants. The present paper provides several agreements and recommendations for management of astigmatism during cataract surgery, which could potentially minimize the variability in practice patterns and help ophthalmologists adopt optimal practices for cataract patients with astigmatism and improve patient satisfaction.

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“…Optical coherence tomography (OCT) and Scheimpflug anterior segment analysis systems can directly measure the posterior cornea surface, which is more accurate than corneal topography systems [20,21]. The reliability and repeatability of Pentacam have been clinically proven for corneal astigmatism measurements [22,23].…”

Section: Discussionmentioning

confidence: 99%

Effect of 1.8-mm steep-axis clear corneal incision on the posterior corneal astigmatism in candidates for toric IOL implantation

Chen

et al. 2020

BMC Ophthalmol

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Background: In the present study, we aimed to analyze the effects of cataract surgery using a 1.8-mm steep-axis clear corneal incision (CCI) on the posterior corneal surfaces based on the keratometry from the rotating Scheimpflug imaging device (Pentacam HR) in candidates for toric intraocular lens (IOL) implantation. Methods: Preoperative and at least 1-month postoperative data measured by Pentacam HR were collected in patients for toric IOL implantation. Surgically induced astigmatism on the posterior cornea (P-SIA) was calculated based on the preoperative and postoperative keratometric data, and the related factors of P-SIA were analyzed. Results: A total of 60 eyes from 56 patients were enrolled. The preoperative anterior, posterior and total corneal astigmatism was 1.58 ± 0.61 D,0.28 ± 0.22 D and 1.70 ± 0.52 D respectively. The postoperative anterior, posterior and total corneal astigmatism was 1.26 ± 0.68 D, 0.41 ± 0.26 D and 1.30 ± 0.51 D respectively. The astigmatism was significantly decreased on anterior surface (P<0.001, paired t-test) and increased on posterior surface (P<0.001, paired t-test). The mean of P-SIA calculated by Holladay-Cravy-Koch method was 0.34 ± 0.20 D, with 0.5 D or greater accounting for 26.7%. A statistically significant correlation was observed between the P-SIA and preoperative anterior corneal astigmatism (r = 0.29, P = 0.024), as well as preoperative posterior corneal astigmatism (r = 0.27, P = 0.038). Multivariate regression analysis showed the preoperative anterior and posterior corneal astigmatism had a significant effect on P-SIA (F = 7.344, P = 0.001). Conclusions: In candidates for toric IOL implantation with a 1.8-mm steep-axis CCI, the incision caused a significant reduction of the anterior corneal astigmatism but an increase of the posterior corneal astigmatism. P-SIA could not be ignored, and it played a significant role in SIA, especially in cases with higher preoperative anterior or posterior corneal astigmatism.

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Accuracy of Total Corneal Astigmatism Measurements With a Scheimpflug Imager and a Color Light-Emitting Diode Corneal Topographer

Cited by 33 publications

References 19 publications

Age‐related changes in with‐the‐rule and oblique corneal astigmatism

Age‐related changes in with‐the‐rule and oblique corneal astigmatism

<p>Consensus on the management of astigmatism in cataract surgery</p>

Effect of 1.8-mm steep-axis clear corneal incision on the posterior corneal astigmatism in candidates for toric IOL implantation

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