Physiology of Astigmatism

Mohammadi, Saeed; Tahvildari, Maryam; Z-Mehrjardi, Hadi

doi:10.5772/18068

Cited by 4 publications

(4 citation statements)

References 97 publications

(104 reference statements)

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“…24 The age-related shift to against-therule astigmatism has been demonstrated in many ethnicities, including Caucasian, 13 Iranian, 25 Singapore Malaysian 26 and South Indian. 27 The proposed theories for this shift include decreased eyelid tension with ageing 28 and repeated near work involving downward gaze and near vision accommodation. 29,30 In concordance with other studies, against-the-rule astigmatism was more prevalent in our predominantly elderly cataract population.…”

Section: Comparison Of Biometric Parametersmentioning

confidence: 99%

Demographics and ocular biometric characteristics of patients undergoing cataract surgery in Auckland, New Zealand

Yoon

Misra

McGhee

et al. 2015

Clinical Exper Ophthalmology

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Section: Comparison Of Biometric Parametersmentioning

confidence: 99%

Demographics and ocular biometric characteristics of patients undergoing cataract surgery in Auckland, New Zealand

Yoon

Misra

McGhee

et al. 2015

Clinical Exper Ophthalmology

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“…Whereas the causes of ATR astigmatism are age related factors, muscle tension in near task and reduce tear film. 11 Similarly, prevalence of myopic WTR astigmatism and Hypermetropic WTR astigmatism were 60.46% and 16.27% respectively.…”

Section: Discussionmentioning

confidence: 91%

Prevalence of astigmatism in school going children: a hospital-based study at Majeedia Hospital, New Delhi

Ali¹,

Kumari²,

Dubey³

et al. 2022

Int J Community Med Public Health

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Background: Generally, astigmatism is type of refractive error due to distorted and irregular of the cornea. It’s generally related to the cornea and lens.Methods: This is cross-sectional study conducted over a period from January 2017 till April 2017 among the patients in HAHC hospital. A comprehensive eye examination was used to analyse the refractive error (astigmatism). And the research was approved by the institutional review board and the ethics committee for at department of paramedical sciences, Jamia Hamdard New Delhi India.Results: A total of 90 patients were included in the study. Out of which 37 were boys and 52 were girls. The rate of myopic astigmatism increased with age. In contrast, the rate of hyperopic and mixed astigmatism decreased with age. In addition, the rate of with-the-rule astigmatism increased and the rate of against-the-rule decreased with respect to age, but oblique astigmatism was rather stable with age.Conclusions: There was more myopic astigmatism and with-the-rule astigmatism in total of 90 patients. Our hospital-based study shows there are high percentage of astigmatism (47.8%) in school aged children in south Delhi region. It is important to study in future, to further evaluate the causes and magnitude of astigmatism and increase awareness among school going children in South Delhi.

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“…7,9–11,18 Increased need for near vision with increased frequency of downward gaze and diminished eyelid tension were speculated to contribute to this astigmatic shift at advanced ages. 23,24 In a study from New Zealand, WTR astigmatism was more prevalent in Maori and Pacific individuals than in individuals of other etnicities. 12 Moreover, the proportion of patients with WTR astigmatism remained high in all age groups of the Maori population.…”

Section: Discussionmentioning

confidence: 95%

Comparison of corneal astigmatism characteristics and prevalence of corneal astigmatism between Turkish individuals and Syrian refugees

Güven

2021

European Journal of Ophthalmology

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Purpose: To compare the prevalence, magnitude and type of corneal astigmatism between Turkish individuals and Syrian refugees. Material and methods: Data of patients scheduled for cataract surgery between January 2019 and 2020 were reviewed. The patients were randomly stratified according to their ethnicity (Turkish individuals or Syrian refugees). Keratometry was performed with the keratometer of IOLMaster 500. Quantitative analysis was performed using the power vector method (J0 and J45). The association between age and astigmatism in the two groups was explored. Results: The study included 4085 eyes of 2049 patients (3962 eyes of Turkish individuals and 123 eyes of Syrian refugees). The mean magnitude of corneal astigmatism, J0, J45 and prevalence of against the rule (ATR) astigmatism and with the rule (WTR) astigmatism were 1.01 D, 0.06, 0.01 D, 37.6% and 43.7% in Turkish individuals and 1.13 D, −0.02, 0.07 D, 46.3% and 37.4% in Syrian refugees, respectively. There were no significant differences according to age, sex, right/left eyes, corneal astigmatism magnitude, keratometric values, J0 and J45 ( p > 0.05) between the two groups. Below 40 years of age, the mean corneal astigmatism magnitude in Syrian refugees was significantly higher than that in Turkish individuals ( p = 0.037). At all ages, ATR astigmatism prevalence was higher in Syrian refugees than in Turkish individuals. ATR astigmatic shift began at a younger age in Syrian refugees ( p = 0.037). Age- and sex-adjusted analysis showed that J0 was significantly lower in Syrian refugees than in Turkish individuals ( p = 0.013). Conclusion: The prevalence and magnitude of ATR astigmatism were higher and onset earlier in Syrian refugees than in Turkish individuals.

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Physiology of Astigmatism

Cited by 4 publications

References 97 publications

Demographics and ocular biometric characteristics of patients undergoing cataract surgery in Auckland, New Zealand

Demographics and ocular biometric characteristics of patients undergoing cataract surgery in Auckland, New Zealand

Prevalence of astigmatism in school going children: a hospital-based study at Majeedia Hospital, New Delhi

Comparison of corneal astigmatism characteristics and prevalence of corneal astigmatism between Turkish individuals and Syrian refugees

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