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The Impact of Changes in Corneal Back Surface Astigmatism on the Residual Astigmatic Refractive Error following Routine Uncomplicated Phacoemulsification
Joint Authors
Tutchenko, Larysa
Patel, Sudi
Voytsekhivskyy, Oleksiy
Skovron, Mykhailo
Horak, Olha
Source
Issue
Vol. 2020, Issue 2020 (31 Dec. 2020), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2020-07-22
Country of Publication
Egypt
No. of Pages
10
Main Subjects
Abstract EN
Purpose.
To determine the significance of any association between intersessional changes in ocular residual astigmatism (RA) and astigmatism at corneal front (FSA) and back (BSA) surfaces following uneventful routine phacoemulsification.
Methods.
Astigmatism was evaluated by autorefractometry and subjective refraction and at both the corneal surfaces with Orbscan II™ (Bausch & Lomb) over central 3 mm and 5 mm optical zones at 1, 2, and 3 months after routine phacoemulsification in 103 patients implanted with monofocal nontoric intraocular lenses (IOLs, one eye/patient).
Data were subjected to vector analysis to determine the actual change (Δ) in astigmatism (power and axis) for the refractive and Orbscan II findings.
Results.
The number of cases that attended where ΔRA was ≥0.50 DC between 1 and 2 months was 52 by autorefractometry and 36 by subjective refraction and between 2 and 3 months was 24 by autorefractometry and 19 by subjective refraction.
Vector analysis revealed significant correlations between ΔFSA and ΔRA for data obtained by autorefractometry but not by subjective refraction.
At all times, ΔBSA was greater than ΔFSA (p<0.01).
Key findings for ΔBSA values over the central 3 mm zone were between (A) the sine of the axis of ΔRA (y) and sine of the axis of ΔBSA (x) for the data obtained by autorefractometry (between 1 and 2 months, y = 0.749 − 0.303x, r = 0.299, n = 52, p=0.031) and subjective refraction (between 2 and 3 months, y = 0.6614 − 0.4755x, r = 0.474, n = 19, p=0.040) and (B) ΔRA (y) and ΔBSA (x) powers between 2 and 3 months postoperatively for the data obtained by autorefractometry (ΔRA = 0.118 ΔBSA + 0.681 r = 0.467, n = 24, p=0.021) and subjective refraction (ΔRA = 0.072 ΔBSA + 0.545 r = 0.510, n = 19, p=0.026).
Conclusion.
Changes in the ocular residual refractive astigmatic error after implanting a monofocal nontoric IOL are associated with changes in astigmatism at the back surface of the cornea within the central optical zone.
American Psychological Association (APA)
Tutchenko, Larysa& Patel, Sudi& Voytsekhivskyy, Oleksiy& Skovron, Mykhailo& Horak, Olha. 2020. The Impact of Changes in Corneal Back Surface Astigmatism on the Residual Astigmatic Refractive Error following Routine Uncomplicated Phacoemulsification. Journal of Ophthalmology،Vol. 2020, no. 2020, pp.1-10.
https://search.emarefa.net/detail/BIM-1189654
Modern Language Association (MLA)
Tutchenko, Larysa…[et al.]. The Impact of Changes in Corneal Back Surface Astigmatism on the Residual Astigmatic Refractive Error following Routine Uncomplicated Phacoemulsification. Journal of Ophthalmology No. 2020 (2020), pp.1-10.
https://search.emarefa.net/detail/BIM-1189654
American Medical Association (AMA)
Tutchenko, Larysa& Patel, Sudi& Voytsekhivskyy, Oleksiy& Skovron, Mykhailo& Horak, Olha. The Impact of Changes in Corneal Back Surface Astigmatism on the Residual Astigmatic Refractive Error following Routine Uncomplicated Phacoemulsification. Journal of Ophthalmology. 2020. Vol. 2020, no. 2020, pp.1-10.
https://search.emarefa.net/detail/BIM-1189654
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1189654