Age-related Changes in Anterior, Posterior Corneal Astigmatism in a Korean Population

AbstractThe aim of the study is to explore the distribution patterns and internal correlations of the morphological parameters of the cornea in patients with age-related cataract. The Pentacam HR was used to measure anterior corneal astigmatism (ACA), posterior corneal astigmatism (PCA), total corneal astigmatism (TCA) and keratometric corneal astigmatism (KCA). With age, the proportion of with-the-rule (WTR) ACA decreased from 65.31% to 23.63%, while the against-the-rule (ATR) ACA increased from 26.53% to 56.20%. PCA exceeded 0.50 D in 9.14% of eyes, while 76.35% of them were ATR. The magnitude of ACA was positively correlated with PCA in the whole sample, with a more significant correlation in WTR eyes (sr = 0.349, P < 0.001). The vector summation effect of PCA to ACA changed from compensation to augmentation with aging. In 57.53% of WTR eyes, KCA was overestimated by an average of 0.21 ± 0.17 D, while it was underestimated by 0.38 ± 0.27 D in 87.62% of ATR eyes. In conclusion, among age-related cataract patients, ACA and TCA gradually shifted from WTR to ATR with aging, while most PCA remained as ATR. Ignoring the age-related changes and real PCA might cause overestimation of WTR astigmatism and underestimation of ATR astigmatism.

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Age-Related Changes in Anterior, Posterior, and Total Corneal Astigmatism

Journal of Refractive Surgery ◽

10.3928/1081597x-20140218-01 ◽

2014 ◽

Vol 30 (3) ◽

pp. 192-197 ◽

Cited By ~ 34

Author(s):

Yuta Ueno ◽

Takahiro Hiraoka ◽

Simone Beheregaray ◽

Maki Miyazaki ◽

Mutsuko Ito ◽

...

Keyword(s):

Corneal Astigmatism ◽

Age Related ◽

Anterior Posterior ◽

Age Related Changes ◽

Total Corneal Astigmatism

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

Acta Ophthalmologica ◽

10.1111/aos.13683 ◽

2018 ◽

Vol 96 (6) ◽

pp. 600-606 ◽

Cited By ~ 6

Author(s):

Kristian Naeser ◽

Giacomo Savini ◽

Jesper Flethøj Bregnhøj

Keyword(s):

Corneal Astigmatism ◽

Age Related ◽

Age Related Changes

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Prevalence and Age-Related Changes of Corneal Astigmatism in Patients Undergoing Cataract Surgery in Northern China

Journal of Ophthalmology ◽

10.1155/2020/6385098 ◽

2020 ◽

Vol 2020 ◽

pp. 1-6

Author(s):

Zhizhong Wu ◽

Caijuan Liu ◽

Zhimin Chen ◽

Enrique Mencía-Gutiérrez

Keyword(s):

Cataract Surgery ◽

Young Patients ◽

Northern China ◽

Corneal Astigmatism ◽

Toric Intraocular Lens ◽

Old Patients ◽

Age Related ◽

Study Results ◽

Range Of Values ◽

Age Related Changes

Purpose. To examine the magnitude, orientation, and age-related changes of corneal astigmatism of the eyes before cataract surgery. Setting. Hebei Eye Hospital, Hebei, China. Design. A clinical-based retrospective study. Results. The study consisted of 5662 eyes of 5662 consecutive cataract surgery patients with a mean age of 68.26 ± 10.39 (mean ± standard deviation (SD)) years (range 40 to 97 years), and 59.86% of the patients were women. Mean corneal astigmatism was 0.98 ± 0.76 diopter (D) (range 0.00–9.61 D). Corneal astigmatism of 0.50–0.99 D was the most common range of values (30.08%), followed by 1.00–1.49 D (22.15%), ≤0.50 D (21.21%), and 1.50–1.99 D (10.28%). There was a strong U-shaped relation between corneal astigmatism and age ( p for nonlinearity <.01). With the increase of age, the astigmatism axis gradually changes from with-the-rule (WTR) to against-the-rule (ATR). Moreover, in young patients with age below 65 years, WTR astigmatism was negatively correlated with age, while ATR was positively correlated with age (r = −0.11, p = .001 ; r = 0.10, p = .010 , respectively). However, in the old patients with age above and equal to 65 years, all types of astigmatism were positively correlated with age. Conclusion. This study may provide valuable and practical information to surgeons when selecting the appropriate surgical method and toric intraocular lens (IOLs).

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Gender-differences in age-related changes of corneal astigmatism in Korean cataract patients

BMC Ophthalmology ◽

10.1186/s12886-018-1001-1 ◽

2019 ◽

Vol 19 (1) ◽

Cited By ~ 1

Author(s):

Hyojin Kim ◽

Youngju An ◽

Choun-Ki Joo

Keyword(s):

Gender Differences ◽

Corneal Astigmatism ◽

Age Related ◽

Cataract Patients ◽

Age Related Changes

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Changes in Anterior, Posterior, and Total Corneal Astigmatism after Descemet Membrane Endothelial Keratoplasty

Journal of Ophthalmology ◽

10.1155/2017/4068963 ◽

2017 ◽

Vol 2017 ◽

pp. 1-7 ◽

Cited By ~ 1

Author(s):

Maged Alnawaiseh ◽

Lars Zumhagen ◽

André Rosentreter ◽

Nicole Eter

Keyword(s):

Corneal Astigmatism ◽

Endothelial Keratoplasty ◽

Descemet Membrane Endothelial Keratoplasty ◽

Axis Orientation ◽

Descemet Membrane ◽

Before And After ◽

Vector Difference ◽

Anterior Posterior ◽

Posterior Corneal Astigmatism ◽

Total Corneal Astigmatism

Purpose. To evaluate changes in anterior, posterior, and total corneal astigmatism in patients after Descemet membrane endothelial keratoplasty (DMEK). Methods. We retrospectively included 29 eyes of 23 patients (age 67.6 ± 9.8 years, 13 female, 10 male) after DMEK surgery. The magnitude and axis orientation of anterior, posterior, and total corneal astigmatism before and after DMEK were determined using a rotating Scheimpflug system (Pentacam HR, Oculus). Results. The magnitude of anterior, posterior, and total corneal astigmatism in the central cornea did not change significantly after surgery. Before surgery, we found a significant correlation between the magnitudes of anterior and posterior corneal astigmatism (Spearman’s correlation coefficient rS=0.526, P=0.003), while after surgery this correlation was no longer significant (rS=0.038, P=0.843). There was a significant correlation between the vector difference between preoperative and postoperative posterior astigmatism and the change in corneal pachymetry (rP=0.47, P=0.010). Conclusions. Posterior corneal astigmatism (especially the orientation) and therefore the relationship between anterior and total corneal astigmatism may change after DMEK. This should be considered to improve the accuracy of toric IOL power calculations following phakic DMEK or in combined procedures.

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Age-Related Changes in Corneal Astigmatism

Journal of Refractive Surgery ◽

10.3928/1081597x-20170718-04 ◽

2017 ◽

Vol 33 (10) ◽

pp. 696-703 ◽

Cited By ~ 6

Author(s):

Xu Shao ◽

Kai-Jing Zhou ◽

An-Peng Pan ◽

Xue-Ying Cheng ◽

He-Xie Cai ◽

...

Keyword(s):

Corneal Astigmatism ◽

Age Related ◽

Age Related Changes

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

10.21203/rs.2.24131/v2 ◽

2020 ◽

Author(s):

Xi Li ◽

Xiang Chen ◽

Suhong He ◽

Wen Xu

Keyword(s):

Corneal Astigmatism ◽

Corneal Incision ◽

Toric Iol ◽

Iol Implantation ◽

Clear Corneal Incision ◽

Paired T Test ◽

Anterior Posterior ◽

Anterior Corneal Astigmatism ◽

Posterior Corneal Astigmatism ◽

Total Corneal Astigmatism

Abstract 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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