Astigmatism profile in the elderly population: Tehran Geriatric Eye Study

Astigmatism profile in the elderly population: Tehran Geriatric Eye Study

Purpose To determine the prevalence of astigmatism and its associated factors and examine astigmatism symmetry patterns in an elderly population. Study design Population based cross-sectional study. Methods The present population-based cross-sectional study was conducted on an elderly population abo...

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Bibliographic Details
Published in:Japanese journal of ophthalmology Vol. 66; no. 5; pp. 461 - 473
Main Authors: Hashemi, Hassan, Asharlous, Amir, Yekta, Abbasali, Aghamirsalim, Mohammadereza, Nabovati, Payam, Sadoughi, Mohammad Mehdi, Khabazkhoob, Mehdi
Format: Journal Article
Language:English
Published: Tokyo Springer Japan 01-09-2022
Springer Nature B.V
Subjects:
Astigmatism
Cataracts
Clinical Investigation
Cross-sectional studies
Medicine
Medicine & Public Health
Multiple regression models
Myopia
Older people
Ophthalmology
Population
Population studies
Sampling
Sampling methods
Surgery
Lens opacity
Mirror symmetry
Direct symmetry
Astigmatism
Anisorule astigmatism
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Summary:Purpose To determine the prevalence of astigmatism and its associated factors and examine astigmatism symmetry patterns in an elderly population. Study design Population based cross-sectional study. Methods The present population-based cross-sectional study was conducted on an elderly population above 60 years of age in Tehran, Iran in 2019. The sampling was done using the stratified multistage random cluster sampling method. All study participants underwent a complete optometric examination and slit-lamp biomicroscopy. Results The prevalence of astigmatism higher than -0.50, -1.00, and -2.00 D was 83% (95% CI: 81 -84), 52 % (95% CI: 50 -54), and 19% (95% CI: 17-20), respectively. These prevalence was 79%(95% CI: 77-81), 46(95% CI: 44-49) and 14(95% CI: 13-16) in subjects without a history of ocular surgery, respectively. Based on cylinder power worse than -1.00 D, 10% (95% CI: 9-12), 20% (95% CI: 18-22), and 21% (95% CI:19-23) of study participants had with the rule, against the rule, and oblique astigmatism, respectively. According to the results of the multiple regression model, male gender, older age, low education level, pure posterior subcapsular cataract, pseudophakia, and myopia were independent factors associated with astigmatism. The prevalence of anisorule astigmatism was 57 % (95% CI: 56-59), the most common anisorule astigmatism was against the rule-oblique type with a prevalence of 36% (95% CI: 34-38). Conclusion The prevalence of astigmatism was high in the elderly population of Tehran. More than half of the participants in this study had anisorule astigmatism, and against the rule-oblique combination was more prevalent than other types. A posterior subcapsular cataract, a history of cataract surgery, and myopia were the associated factors of astigmatism in this study.
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content type line 23
ISSN:0021-5155
1613-2246
DOI:10.1007/s10384-022-00936-x