The components of adult astigmatism and their age‐related changes

Rozema, J.; Hershko, Sarah; Tassignon, Marie-José

doi:10.1111/opo.12616

Cited by 17 publications

(15 citation statements)

References 56 publications

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“…Although these findings may have been caused by the small size of the subpopulation, the astigmatic shift toward ATR appeared to start significantly after the subjects reached 40 years of age. Previous findings also supported a general shift from a predominance of WTR astigmatism to a predominance of ATR astigmatism in adults older than 40 years [ 12 , 13 , 15 , 16 ]. The age-related shift towards ATR was not seen in subjects aged ≥ 70 years.…”

Section: Discussionsupporting

confidence: 54%

Ten-year longitudinal investigation of astigmatism: The Yamagata Study (Funagata)

et al. 2022

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Despite numerous investigations into ocular or corneal astigmatism, the dynamic nature of astigmatism remains poorly understood. To reveal potential associations between age and astigmatism, 264 Japanese participants who underwent systemic and ophthalmological examinations in Funagata Town (Yamagata Prefecture, Japan) were evaluated over a 10-year period. Astigmatism was evaluated with regard to the cylinder power, cylinder axis, and vector analyses. Whereas the refractive cylinders showed age-related increases in patients in their 40s to 60s, the corneal cylinders did not change over 10 years. Nevertheless, cylindrical axis of the cornea demonstrated a continuous shift toward against-the-rule (ATR) astigmatism. Vector analyses revealed that the astigmatic shift toward ATR progressed continually after patients reached their 40s, although the shift did not accelerate with age. These novel insights may pave the way for the development of potential strategies for vision correction, including refractive surgeries, and vision-quality maintenance in the elderly.

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Section: Discussionsupporting

confidence: 54%

Ten-year longitudinal investigation of astigmatism: The Yamagata Study (Funagata)

et al. 2022

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“…18,19 Understanding of the distribution, the relationship between the different components of astigmatism and the compensation between anterior corneal and ORA is necessary for the outcome of refractive, and cataract surgeries. 20 Therefore, this study aims to evaluate the contributions of anterior corneal astigmatism and ocular residual astigmatism to autorefraction astigmatism in adult myopic and myopic astigmatic subjects and how these compensate each other.…”

Section: Introductionmentioning

confidence: 99%

<p>Contributions of Anterior Corneal and Ocular Residual Astigmatism to Autorefraction Astigmatism in a Myopic Adult Sample</p>

Gab-Alla¹

2020

OPTH

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Aim To evaluate the contributions of anterior corneal and ocular residual astigmatism to autorefraction astigmatism in adult myopic and myopic astigmatic subjects and how these compensate each other. Subjects and Methods This retrospective study was completed in private eye centre, Ismailia, Egypt, between September 2017 and November 2019. The study included eyes with myopia (0.5 to 10.0D) or myopic astigmatism (0 to 8.5D). The refractive errors, including autorefraction astigmatism, were measured after using 1% cyclopentolate with autorefractometer (Topcon, Tokyo Optical Co., Ltd., Japan). Corneal topography (Sirius; CSO, Florence, Italy) was used to measure anterior corneal astigmatism. Ocular residual astigmatism was measured by vectorial subtraction of the anterior corneal astigmatism from autorefraction astigmatism determined to the corneal plane. Results This study included 1158 eyes (right 582 and left 576) with myopia or myopic astigmatism of 582 participants (206 males with 406 eyes and 376 females with 752 eyes). The mean±SD age of the total participants was 26±5.7 years, range (21 to 50 years). The mean±SD of spherical error was −3.2±1.9D, range (−0.5 to −10.0D). The mean±SD of autorefraction astigmatism was 1.13±1.1D; range (0.5 to 8.5D). The mean±SD of anterior corneal astigmatism was 1.22±0.8D; range (0.03 to 5.6D). The mean±SD of ocular residual astigmatism was 0.6±0.5D; range (0 to 4.8D). Of the total eyes, 75.4% had significant autorefraction astigmatism, 82.5% had significant anterior corneal astigmatism, and 16.8% had significant ocular residual astigmatism. Conclusion The percentage of the significant autorefraction astigmatism (>0.5D) was 75.4% which is mainly anterior corneal. In 26.8% of participants, anterior corneal astigmatism is compensated by ocular residual astigmatism.

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“…The optical characteristics of the lens depend on its shape and refractive index distribution 23 , which can affect its astigmatism to a great extent, thus further causing internal astigmatism to change. It seems that corneal and internal astigmatism cancel each other out 24 . The unity of changes among corneal astigmatism, lens astigmatism and refractive astigmatism, do not occur individually 25 .…”

Section: Discussionmentioning

confidence: 99%

Delicate balance: the relationship between internal astigmatism and lens astigmatism

Dai

Zhou

et al. 2021

F1000Res

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Background: Due to lack of equipment for directly measuring crystal morphology, there has been little research on crystal astigmatism. The purpose of this study was to accurately explore the correlation between internal astigmatism and lens astigmatism in patients with ametropia. Methods: This is a cross-sectional study conducted in the Affiliated Hospital of North Sichuan Medical College, China, in September 2020. Diopter values (refractive astigmatism, RA) of patients with ametropia was recorded, and the corneal and lens biological parameters were measured by CASIA2 (corneal/anterior segment optical correlation tomography analyzer). Biometric parameters, including the total corneal astigmatism (TCA), anterior and posterior curvature radius of the lens (ACL, PCL), internal astigmatism (IA), anterior and posterior astigmatism of the lens (AAL, PAL) were measured. Grouping and comparisons were made according to gender and age. Results: In total, 151 participants (293 eyes) were included in the analysis. There were significant (P<0.05) differences in the IA (Z=-2.194, P=0.028) according to gender, but not in the other parameters. By age group, there were statistically significant differences in the TCA (H=10.609, P=0.005), IA (F=3.722, P=0.025), and PAL (H=8.254, P=0.016), but not in the others. The IA was positively correlated with the age (r=0.155, P=0.008), RA (r=0. 534, P<0.001), AAL (r=0.308, P<0.001), and was negatively correlated with the TCA (r=-0.244, P<0.001). The regression equation between the IA and AAL was: Y (IA) =-0.626 +0.447X (AAL). Conclusions: There is a delicate balance between internal astigmatism and intraocular astigmatism. There were no significant differences in the other parameters except IA for different gender groups. For different ages, there are symbol differences in the TCA, IA and PAL, but not in the other parameters. In the analysis of IA with lens astigmatism, it was found that internal astigmatism was mainly related to AAL, but not to PAL.

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The components of adult astigmatism and their age‐related changes

Cited by 17 publications

References 56 publications

Ten-year longitudinal investigation of astigmatism: The Yamagata Study (Funagata)

Ten-year longitudinal investigation of astigmatism: The Yamagata Study (Funagata)

<p>Contributions of Anterior Corneal and Ocular Residual Astigmatism to Autorefraction Astigmatism in a Myopic Adult Sample</p>

Delicate balance: the relationship between internal astigmatism and lens astigmatism

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