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KMID : 0360220230640090845
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Journal of the Korean Ophthalmological Society
2023 Volume.64 No. 9 p.845 ~ p.850
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Corneal Topographic Changes after Botulinum Toxin-A Injection in Patients with Essential Blepharospasm
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Kim Sang-Yoon
Ahn Jung-Hyo
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Abstract
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Purpose: To compare the corneal topographic change before and after botulinum toxin A injection in patients with essential blepharospasm.
Methods: From September 2015 to December 2020, we enrolled total 20 patients, 40 eyes diagnosed with essential blepharospasm.
We estimated the corneal refractive power and astigmatism before and after Nabota® (Daewoong Co. Ltd, Seoul, Korea) botulinum toxin injection at 1 and 3 months using iTrace® Topography (Software version 4.2.1., Tracey technology Inc., Houston, TX, USA). Corneal refractive power was analyzed in superior, inferior, nasal and temporal location at 1 mm, 3 mm zone. Also, steep and flat keratometry, astigmatism was measured by topography.
Results: Corneal refractive power showed significant difference in superior and inferior location of 1 mm zone at 1 month after botulinum toxin injection (p = 0.038, p = 0.042). There was no significant difference in all four locations of 3 mm zone. At 1 month after toxin injection, steep keratometry was only significant reduced (p = 0.046) and with-the-rule astigmatism was shifted to against-the-rule astigmatism. At 3 months after toxin injection, keratometry and astigmatism was resolved to before toxin injection.
Conclusions: At 1 month after Nabota® (Daewoong Co. Ltd) botulinum toxin injection, corneal refractive power at vertical axis was flattened and steep keratometry was significantly reduced. At 3 months after toxin injection, corneal topographic change was changed to before toxin injection.
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KEYWORD
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Botulinum toxin A, Corneal curvature, Corneal topography, Essential blepharospasm
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