Prevalence of corneal astigmatism before cataract surgery

Mohammadi, Mohammad; Naderan, Mohammad; Pahlevani, Rozhin; Jahanrad, Ali

doi:10.1007/s10792-016-0201-z

Cited by 36 publications

(34 citation statements)

References 38 publications

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“…By contrast, the percentage of WTR astigmatism decreased with age. These findings are consistent with the characteristics seen in populations from different countries and regions [6, 9, 27, 28]. These changes have been found to be due to a discrepancy in eyelid morphology and power [29].…”

Section: Discussionsupporting

confidence: 89%

Evaluation of biometry and corneal astigmatism in cataract surgery patients from Central China

et al. 2017

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BackgroundTo evaluate the distribution of biometric parameters and corneal astigmatism using the IOLMaster device before phacoemulsification in cataract patients in Central China.MethodsConsecutive cataract patients were recruited at the Central Hospital of Wuhan between January 2015 and June 2016. Ocular axial length (AL), keratometry values, anterior chamber depth (ACD) and horizontal corneal diameter (white to white [WTW]) of each cataract-affected eye were measured with the IOLMaster device.ResultsThe study evaluated 3209 eyes of 2821 cataract patients. The mean AL, ACD, and WTW were 24.38 ± 2.47 mm, 3.15 ± 0.48 mm, and 11.63 ± 0.43 mm, respectively. Corneal astigmatism of 0.51–1.00 diopters (D) was the most common range of values (34.96%). A total of 10.56% patients exhibited a corneal astigmatism greater than 2.0 D. The flat and steep keratometry values gradually increased with age. The mean ACD and WTW showed increasing trends as the AL increased (P < 0.001). When the AL was shorter than 26.0 mm, the keratometry decreased as AL increased. The against-the-rule (ATR) astigmatism proportion increased with age and the with-the-rule (WTR) astigmatism proportion decreased with age.ConclusionsThe profile of ocular biometric data and corneal astigmatism may help ophthalmologists improve their surgical procedures and make an appropriate IOL choice to gain a high quality of postoperative vision.

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Section: Discussionsupporting

confidence: 89%

Evaluation of biometry and corneal astigmatism in cataract surgery patients from Central China

et al. 2017

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“…It is well known that the corneal astigmatism could be influenced by the cut we make into the cornea to enter into the eye. For this reason several authors concentrated their attention on how to minimize astigmatism onset after surgery, focusing their attention to the astigmatism present before 22–24 and after surgery. 25–29 To make such an evaluation, it is mandatory to perform a vectorial analysis.…”

Section: Discussionmentioning

confidence: 99%

Axial Length Shortening After Cataract Surgery: New Approach to Solve the Question

Bernardo

Salerno

Cornetta

et al. 2018

Trans. Vis. Sci. Tech.

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PurposeTo check if optical biometry can detect eventual corneal power (Km) and axial length (AL) cataract surgery-related changes that could influence the refractive outcome.MethodsPatients scheduled for sequential bilateral cataract surgery between January and September 2017 were included in the present study. One hundred ninety-six eyes of 98 patients (48 males) were selected. Before surgery of the first eye, patients underwent a complete ophthalmic examination, including IOLMaster biometry; the same evaluations were repeated in both eyes the day before the fellow eye cataract surgery, performed at least 2 months after the first one. The differences in Km and AL in the first operated eyes were evaluated, and the fellow eyes were used as controls.ResultsKm differences in the operated eyes ranged from −1.97 to +0.98 diopter (D) (mean = −0.02 ± 0.36 D) (P = 0.89); in the nonoperated eyes they ranged from −0.6 to +0.7 D (mean = 0 ± 0.20 D) (P = 0.91). The AL differences (pseudophakic option) in the operated eyes ranged from −0.35 to +0.15 mm (mean = −0.10 ± 0.08 mm) (P < 0.001); with the aphakic option they ranged from −0.24 to + 0.26 mm (mean = 0.01 ± 0.08 mm) (P= 0.38). In the nonoperated eyes, the AL differences ranged from −0.04 to +0.06 mm (mean= 0 ± 0.02 mm) (P = 0.02).ConclusionsThe modern phaco-technique seems not to induce changes in Km and AL, supporting the hypothesis that the differences in AL are due to an incorrect estimation in pseudophakic eyes.Translational RelevanceThe results of our study may improve the AL measurements in pseudophakic eyes.

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“…An estimated three-quarters of eyes undergoing cataract surgery have astigmatism >0.5 D 1 – 3 and one-third have >1.0 D. 1 , 2 , 4 The correction of pre-existing astigmatism is fundamental to the goal of achieving emmetropia and increased spectacle independence after cataract surgery. 5 Partial-thickness arcuate incisions, corneal limbal relaxing incisions, and toric IOLs are the most commonly performed procedures to address pre-existing astigmatism at the time of cataract surgery; however, astigmatic outcomes are often suboptimal, particularly in patients with pre-existing dry eye.…”

Section: Introductionmentioning

confidence: 99%

<p>Impact of Thermal Pulsation Treatment on Astigmatism Management and Outcomes in Meibomian Gland Dysfunction Patients Undergoing Cataract Surgery</p>

Matossian¹

2020

OPTH

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This study aimed to assess the effects of thermal pulsation system (TPS) treatment on astigmatism management in meibomian gland dysfunction (MGD) patients undergoing cataract surgery. Patients and Methods: This single-center pilot study included 25 eyes of 23 patients who had visually significant cataract and concomitant MGD-associated dry eye in at least 1 eye and were willing to undergo TPS treatment and wait for at least 6 weeks for tear film stabilization prior to cataract surgery. Post-TPS keratometric readings were used for presurgical planning, and the actual postoperative residual refractive astigmatism (RRA) was recorded. Pre-TPS keratometry was used to mathematically simulate the RRA that would have been obtained from the lens choice and astigmatism management without TPS treatment. Results: Following TPS treatment, the magnitude of astigmatism increased in 52% of eyes, decreased in 24%, and remained unchanged in 24%. Correspondingly, astigmatism treatment modality changed in 68% of eyes after tear film stabilization with TPS treatment. The type of astigmatism management increased (ie, shifted from no treatment to LRI or LRI to toric IOL) in 25% of eyes and decreased in 8%. Actual RRA ≤0.5 D was achieved in 76% of eyes, compared to simulated RRA ≤0.5 D in 40% of eyes (p=0.004). Conclusion: Stabilization of the tear film with TPS treatment resulted in less RRA than if pre-TPS keratometric readings had been used to determine the astigmatism management method and toric IOL power and axis.

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Prevalence of corneal astigmatism before cataract surgery

Cited by 36 publications

References 38 publications

Evaluation of biometry and corneal astigmatism in cataract surgery patients from Central China

Evaluation of biometry and corneal astigmatism in cataract surgery patients from Central China

Axial Length Shortening After Cataract Surgery: New Approach to Solve the Question

<p>Impact of Thermal Pulsation Treatment on Astigmatism Management and Outcomes in Meibomian Gland Dysfunction Patients Undergoing Cataract Surgery</p>

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