Astigmatism Orientation After Deep Anterior Lamellar Keratoplasty for Keratoconus and Its Correlation With Preoperative Peripheral Corneal Astigmatism. Issue 2 (February 2020)

• Record Type: Journal Article
• Authors: Elkadim, Mohamed; Myerscough, James; Bovone, Cristina; Busin, Massimo
• Is Part Of: Cornea. Volume 39:Issue 2(2020)
• Publication Date: 2020-02
• Subjects: astigmatism -- DALK -- orientation -- prediction -- axis; Cornea -- Periodicals; Cornea -- Periodicals; Cornée -- Périodiques; 617.719
• DOI: 10.1097/ICO.0000000000002175
• Languages: English
• ISSNs: 0277-3740

Abstract

Abstract : Purpose: To evaluate the orientation of keratometric astigmatism (KA) after deep anterior lamellar keratoplasty (DALK) for keratoconus and its correlation with preoperative peripheral KA. Methods: This is a retrospective, single-center observational study including keratoconic patients undergoing DALK between January 2016 and January 2017 with regular astigmatism postoperatively. The orientation of postoperative KA was classified as with-the-rule (WTR), against-the-rule, or oblique and was correlated with the corresponding preoperative peripheral KA, calculated by the sinusoidal fitting of points of the axial keratometric power map at 8 mm diameter. Results: Forty-one keratoconic eyes were included, with the most common orientation of KA post-DALK being WTR (65.9%), followed by against-the-rule (19.5%) and oblique (14.6%). A significant correlation was found between preoperative peripheral KA and post-DALK KA regarding axis ( P < 0.001, r = 0.88) and power ( P = 0.0128, r = 0.23). Conclusions: The axis of post-DALK astigmatism and to a lesser extent its respective power in keratoconic eyes can be predicted using the preoperative peripheral KA, with "WTR" being the most common astigmatic orientation.