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Prevalence of Types of Corneal Astigmatism before Cataract Surgery
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| Author:
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AMIN NAJAFI, HABIB OJAGHI , TELMA ZAHIRIAN MOGHADAM, AFSHAN SHARGHI
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| Abstract:
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PURPOSE: The current study was performed to analyze the prevalence and presentation patterns of corneal
astigmatism types in cataract surgery candidates.
METHODS: Preoperative corneal astigmatism were prospectively measured with Autokeratometer in 780
patients (1018 eyes) during the year (2018) in cataract surgery (phacoemulsification) candidates. Descriptive
and analytical statistics of astigmatism severity and keratometric data were performed based on age and sex.
RESULTS: A total of 1018 eyes of 780 patients were included in the present study, of which 445 (57.1%)
were female and 335 (42.9%) were male. Of the 1018 evaluated eyes, 590 (58%) were female and 428 (42%)
were male. The mean age of the patients was determined as 65.88 ± 11.43 years. The mean flat and steep-axis
keratometric values were recorded as 44.75 ± 1.86 D and 43.82 ± 1.69 D, respectively. Women showed
significantly steeper corneas. Based on LOCS III system, the types of cataracts were as follows: Posterior
subcapsular 37.4%, nuclear 28%, cortical 1%, and mixed 33.6%. Types of astigmatism were as follows: 34.7%
with-the-rule (WTR), 29.3% against-the-rule (ATR), 35.3% oblique and 0.7% had no astigmatism. A significant
relationship of the type of astigmatism with gender and age group was observed (P <0.001), where the
prevalence of WTR and ATR were found to be higher among women and men, respectively. The prevalence of
WTR was higher among lower age groups, while the prevalence of ATR was found to be higher among older
age groups. Furthermore, 70.8% of the eyes revealed astigmatism of at least 0.5 diopters, followed by
astigmatism of at least 1 diopter (33.6%), astigmatism of at least 1.5 diopters (16.2%0, and astigmatism of at
least 2 diopters (9.2%).
CONCLUSIONS: The Findings showed a significant prevalence of astigmatism greater than one diopters in
these patients. The results of the study could provide valuable data for cataract surgeons and IOL
manufacturers regarding the prevalence and type of corneal stigmatism.
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| Keyword:
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Cataract surgery, corneal astigmatism, keratometry, WTR, ATR, Oblique.
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| EOI:
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| DOI:
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