Astigmatism Prevalence and Biometric Analysis in Normal Population

Németh, Gábor; Szalai, Eszter; Berta, András; Módis, László

doi:10.5301/ejo.5000294

Cited by 51 publications

(52 citation statements)

References 29 publications

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“…By contrast, the percentage of WTR astigmatism decreased with age. These findings are generally consistent with those of previous studies [7, 13, 15, 16]. …”

Section: Discussionsupporting

confidence: 93%

Prevalence of Corneal Astigmatism in Patients before Cataract Surgery in Northern China

Yuan

Song

Peng

et al. 2014

Journal of Ophthalmology

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Purpose. To analyze the prevalence and presentation patterns of corneal astigmatism in cataract surgery candidates in a teaching hospital in northern China. Methods. From May 1, 2012, to April 30, 2013, partial coherence interferometry (IOLMaster) measurements of all qualified cataract surgery candidates were retrospectively collected and analyzed. Results. The study evaluated 12,449 eyes from 6,908 patients with a mean age of 69.80 ± 11.15 (SD) years. The corneal astigmatism was 0.5 diopters (D) or less in 20.76% of eyes, 1.0 D or more in 47.27% of eyes, 2.0 D or more in 13.16% of eyes, and 3.0 D or more in 3.75% of eyes. With-the-rule astigmatism was found in 30.36% of eyes, while against-the-rule was found in 52.41% of eyes. The percentage of against-the-rule astigmatism increased with age. Conclusion. Our study showed that almost one-half of preoperative eyes (47.27%) in northern China have a corneal astigmatism of 1.0 D or more, indicating that more surgical techniques or toric IOLs are needed to achieve better visual rehabilitation.

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“…By contrast, the percentage of WTR astigmatism decreased with age. These findings are generally consistent with those of previous studies [7, 13, 15, 16]. …”

Section: Discussionsupporting

confidence: 93%

Prevalence of Corneal Astigmatism in Patients before Cataract Surgery in Northern China

Yuan

Song

Peng

et al. 2014

Journal of Ophthalmology

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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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“…Studies suggest that CA orientation may change with age, and WTR, common in young children, gradually shifts to ATR and OBL as age increases. 33,34 IA has been attributed to the refracting power of the lens, posterior cornea, and errors in optical centration. Some studies have concluded that CA exceeds TA by 0.5 D on average and that no internal compensation for CA exists.…”

Section: Discussionmentioning

confidence: 99%

Preschool Children Exhibit Evident Compensatory Role of Internal Astigmatism in Distribution of Astigmatism: The Nanjing Eye Study

Wang

Huang

Chen

et al. 2019

Invest. Ophthalmol. Vis. Sci.

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PURPOSE. To determine the prevalence and associated risk factors for total, corneal, and residual astigmatism and to evaluate the relations between components of astigmatism in Chinese preschool children. METHODS. In the population-based, cross-sectional Nanjing Eye Study, children were measured for noncycloplegic refractive error using an autorefractor and for biometric parameters using an optical low-coherent reflectometry. Data from right eyes were analyzed to calculate the prevalence of astigmatism using various cutpoints (0.5, 1.0, and 1.5 diopters [D]) and for determining risk factors using logistic regression models. Relations between astigmatism components were assessed using Spearman correlation coefficients (q). RESULTS. Of 1817 children (mean 6 SD of age: 54.8 6 3.5 months, 54.2% male), the median (1st and 3rd quartile) of total, corneal, and residual astigmatism (vectorial difference between total and corneal astigmatism) was À0.25 (À0.50, 0), À1.06 (À1.49, À0.72), and À0.92 (À1.23, À0.62) D and their prevalence rate 1.0 D or more was 14.2%, 56.1%, and 44.2%, respectively. With-the-rule was the most common type in total astigmatism (75.2%) and in corneal astigmatism (88.2%) while against-the-rule was predominant in residual astigmatism (75.6%). A negative correlation was found between corneal J 0 and internal J 0 (q ¼ À0.74, P < 0.001) and between corneal J 45 and internal J 45 (q ¼ À0.87, P < 0.001). Based on compensation factor (CF), defined as the minus ratio of internal astigmatism (vectorial difference between total and anterior corneal astigmatism) and anterior corneal astigmatism, internal J 0 compensated for total J 0 in varying degrees (CF: 0.1-2) in 91.5% cases, while that percentage for J 45 component was 77.2%. In univariate logistic regression model, older age was significantly associated with total astigmatism (odds ratio [OR] ¼ 0.96 for per-month increase, P ¼ 0.03), and larger axial length-corneal radius ratio was significantly associated with higher risk of residual astigmatism (OR ¼ 2.28 for per unit increase, P ¼ 0.03). CONCLUSIONS. The compensatory role of internal astigmatism on reducing corneal astigmatism was prominent in preschool children. Larger axial length-corneal radius ratio was significantly associated with higher risk of residual astigmatism.

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Astigmatism Prevalence and Biometric Analysis in Normal Population

Cited by 51 publications

References 29 publications

Prevalence of Corneal Astigmatism in Patients before Cataract Surgery in Northern China

Prevalence of Corneal Astigmatism in Patients before Cataract Surgery in Northern China

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

Preschool Children Exhibit Evident Compensatory Role of Internal Astigmatism in Distribution of Astigmatism: The Nanjing Eye Study

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