Astigmatismus

Woltsche, Nora; Werkl, Peter; Posch-Pertl, Laura; Ardjomand, Navid; Фрингс, Андреас

doi:10.1007/s00347-019-0865-7

Cited by 6 publications

(3 citation statements)

References 43 publications

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“…The prevalence of astigmatism increases with age [3], and previous studies reported prevalences from 11.3 to 70 % [1,4]. The estimated world-prevalence of astigmatism is 40.4 % for cylinder powers above 0.5 D [7] and 23.9 % for cylindrical powers higher than 1.0 D [8].…”

Section: Introductionmentioning

confidence: 85%

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Objective evaluation of static and dynamic behavior of different toric silicone-hydrogel contact lenses

García

González-Pérez

2021

Contact Lens and Anterior Eye

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The present study aimed to estimate how orientation position, recovery time, and contact lens decentration, associated with visual performance, may vary on several designs of the most recent toric siliconehydrogel toric contact lenses in two-time different moments. Methods: To evaluate the toric silicone-hydrogel toric contact lens position and stability, it was conducted with a prospective, observational, randomized, and single-center case series including 95 astigmatic eyes wearing four toric silicone-hydrogel toric contact lenses for two weeks. Orientation and decentration were analyzed with ImageJ software from video-frames extracted with a Python application. Recovery time was evaluated after 45 degrees of inferior-temporal misorientation. Results: Evaluation of misorientation after 20 min of wear revealed the highest amount for Saphir RX, − 20.41 ± 10.84 deg, and lowest for Air Optix Aqua for Astigmatism, − 1.43 ± 7.48 deg. The highest horizontal misalignment was found for Air Optix Aqua for Astigmatism, − 0.627 ± 0.330 mm, and lowest for Biofinity Toric, 0.004 ± 0.270 mm. Vertical misalignment presented the highest value for Acuvue Vita for Astigmatism, − 0.652 ± 0.369 mm, and lowest for Air Optix Aqua for Astigmatism, − 0.126 ± 0.231 mm. Recovery time showed the highest amount for Saphir RX, 80.70 ± 33.26 s, and lowest for Biofinity Toric 43.67 ± 23.70 s. Only Air Optix Aqua for Astigmatism presented significant differences after two-week of wear for misorientation (P = 0.02) and horizontal misalignment (P < 0.001). When pairwise comparisons are made between toric silicone-hydrogel toric contact lenses, significant differences (P < 0.001) are found. Conclusions: Although there was acceptable fitting, based upon decentration, orientation, and recovery with the study contact lenses, the stabilization and profile design used in the Air Optix Aqua for Astigmatism helped to minimize rotation and vertical misalignment. In addition, the peri-ballast and thickness profile of the Biofinity Toric improved rotational recovery and horizontal misalignment compared to the other contact lenses. Finally, lenses with a better fitting profile showed better visual performance.

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Section: Introductionmentioning

confidence: 85%

“…Astigmatism can be treated with surgical procedures, including excimer laser-assisted keratomileusis, photorefractive keratectomy, or femtosecond laser-assisted keratotomy [7]. Although astigmatism is often corrected with reversible methods such as spectacles and rigid or soft contact lenses.…”

Section: Introductionmentioning

confidence: 99%

Objective evaluation of static and dynamic behavior of different toric silicone-hydrogel contact lenses

García

González-Pérez

2021

Contact Lens and Anterior Eye

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“…Astigmatism is the most common refractive error in the world, which may come from congenital or acquired factors 1 . Astigmatism can change from birth, and its development is influenced by many factors such as heredity, extraocular muscle tension, visual feedback and eyelid pressure 2 .…”

Section: Introductionmentioning

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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