Prevalence of corneal astigmatism in cataract surgery candidates at a public
            hospital in Brazil

Theiss, Mara Barreto; Santhiago, Marcony R.; Moraes, Haroldo Vieira de; Gomes, Beatriz Fiuza

doi:10.5935/0004-2749.20190071

Cited by 6 publications

(7 citation statements)

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“…The mean age of the cohort in this study was 64.75 ± 9.66 years (range 40 to 103), which was younger than the mean age of the cohort in southern China (70.56 ± 9.55 years (range 40 to 95) [ 8 ]), the age figure reported by Theiss et al in a Brazilian population (77.13 ± 9.55 years (range 49 to 92) [ 3 ]), and the figures reported by Lekhanont et al (74.9 ± 9.8 years (range 30 to 94) in Thailand's population [ 11 ]). In terms of gender, women in western China accounted for 52.77%, while women in southern China accounted for 61.74%, which was significantly higher than the former.…”

Section: Discussioncontrasting

confidence: 57%

“…Therefore, preoperative corneal astigmatism in patients has attracted extensive attention [ 1 , 2 ]. Some studies have observed the distribution of astigmatism in regions such as Brazil [ 3 ], northeastern India [ 4 , 5 ], southern Europe [ 6 ], and the United Kingdom [ 1 , 7 ]. In China, there are only studies reported in the southern, northern, and central [ 8 – 10 ] regions.…”

Section: Introductionmentioning

confidence: 99%

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

Chen

et al. 2020

Journal of Ophthalmology

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Purpose. To investigate the demographics and distribution of corneal astigmatism before cataract surgery in patients from western China and to compare and analyze these findings with those of patients in southern China. Setting. People’s Hospital of Xinjiang Uygur Autonomous Region. Design. Clinical-based cross-sectional study. Methods. Patients undergoing cataract surgery in the People’s Hospital of Xinjiang Uygur Autonomous Region from February 2012 to August 2019 were recruited. Preoperative keratometric data measured by performing preoperative bilateral partial coherence interferometry (IOLMaster), and patient demographics were recorded and analyzed. Results. This study comprised 12,236 eyes of 7065 patients with a mean age of 64.75 ± 9.66 years, and 52.77% of the patients were female. The mean axial length was 23.14 ± 0.96 mm. Astigmatism ranged from 0 diopters (D) to 6.94 D, with a mean of 1.28 D. Corneal astigmatism was between 0.25 D and 1.25 D in 53.71% of eyes, 1.25 D or higher in 39.06% eyes, and less than 0.25 D in 7.23% of eyes. Astigmatism was with the rule (WTR) in 41.94% of the patients and against the rule (ATR) in 38.80% of patients. The mean flat and steep keratometry measurement was 43.19 ± 1.50 D and 44.24 ± 1.62 D, respectively. After matching, corneal astigmatism in western China was 1.30 ± 1.03 D, and it was significantly higher than that in southern China (0.98 ± 0.67 D, P<0.001). After matching, the proportion of WTR astigmatism was 40.99% in western China, which was also significantly higher than the proportion (26.46%) in southern China (P<0.001). Conclusion. Corneal astigmatism in patients before cataract surgery in western China was mainly between 0.25 D and 1.25 D. Compared with patients in southern China, patients in western China are younger, have a much higher degree of astigmatism, and have a higher proportion of WTR astigmatism.

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Section: Discussioncontrasting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

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

Chen

et al. 2020

Journal of Ophthalmology

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“…This has in turn led to emphasis on the reduction or elimination of pre-existing corneal astigmatism as this is the second most important factor to reduce spectacle dependence. It is estimated that corneal astigmatism of more than 1.0D is found in up to 40% [ 1 ] of patients presenting for cataract surgery, 1.5D or more is present in over 20% [ 2 ] and above 2.0D in 10% [ 3 ] of patients. There are various ways of correcting corneal astigmatism at the time of cataract surgery, and it includes incision placed on the steep axis of the cornea [ 4 ], addition of opposite clear corneal incision (OCCI) [ 5 ], single or paired limbal relaxing incisions (LRI) [ 4 , 6 , 7 ]and the use of toric IOLs [ 4 , 6 – 9 ].…”

Section: Introductionmentioning

confidence: 99%

Do limbal relaxing incisions during cataract surgery still have a role?

2022

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Background Though Limbal Relaxing Incisions (LRI) were used widely to correct pre-existing corneal astigmatism during cataract surgery, they have been replaced recently with the more expensive methods like the use of toric Intra Ocular Lenses (IOL) and femtosecond during cataract surgery. We conducted our study to re-evaluate the role of (LRI) in correcting pre-existing moderate corneal astigmatism during cataract surgery in settings where other options are neither available nor affordable. Methods Retrospective analysis of all consecutive cases of LRI performed by a single surgeon at the time of cataract surgery to correct moderate corneal astigmatism (1.5-3D) in a community hospital over a period of 6 months. Corneal astigmatism, uncorrected distance visual acuity (UDVA) and best corrected distance visual acuity (CDVA) were recorded pre-operatively, 4 weeks and 3 months post-operatively. Data on age, intraocular lens (IOL) power, predictive refraction and post-operative spherical equivalent was also collected and analyzed. The number and position of LRI was determined based on the pre-existing corneal astigmatism using online calculator. Results 29 eyes of 25 patients with the mean age of 73.6 years (range: 46 to 90 years) and corneal astigmatism between 1.5 to 3D were included. Statistically significant reduction in the mean corneal astigmatism was recorded from 2.05 ± 0.45D preoperatively to 0.85 ± 0.56D postoperatively (P < 0.0001). All eyes showed reduction in astigmatism; 83% of eyes had < 1.0D post-operatively and 66% of eyes had < 0.75D. UDVA of 6/9 or better was recorded in 80% of eyes post-operatively (CDVA of 6/9 or better in 100%). The spherical equivalent was within 1.0D of the predictive refraction postoperatively in nearly all eyes (97%) and within 0.5D in 86% of the eyes. There were no peri-operative or post-operative complications were recorded in any case. Conclusion Combining LRI and cataract surgery to address moderate degrees of corneal astigmatism is a safe, reliable and predictable option especially in areas where more expensive methods such as toric IOL or excimer laser are not available or affordable. LRI has no significant effect on the spherical equivalent and is an excellent tool in reducing patient’s spectacle dependence.

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“…1 The prevalence of astigmatism (>1.00 D) varies over a wide range through the different studies, from 17% to 63%. [2][3][4][5][6][7] The origin of ocular astigmatism is not always purely corneal. 8 Two components of astigmatism can be individually measured: autorefraction astigmatism (ARA) and anterior corneal astigmatism (ACA), which arises from the anterior corneal surface.…”

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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Prevalence of corneal astigmatism in cataract surgery candidates at a public hospital in Brazil

Cited by 6 publications

References 0 publications

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

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

Do limbal relaxing incisions during cataract surgery still have a role?

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

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