ISSN: 2459 - 1777 | E-ISSN 2587-0394
Volume: 4
Issue: 1
Year: 2019
An analysis of Scheimpflug Holladay equivalent keratometry readings following corneal collagen cross-linking [Beyoglu Eye J]
Beyoglu Eye J. Ahead of Print: BEJ-35220 | DOI: 10.14744/bej.2019.35220  

An analysis of Scheimpflug Holladay equivalent keratometry readings following corneal collagen cross-linking

Ayhan Sağlık1, Hakim Çelik2, Mustafa Aksoy1
1Department of Ophthalmology, Harran University, Şanlıurfa, Turkey
2Department of Physiology, Harran University, Şanlıurfa, Turkey

INTRODUCTION: To compare Holladay equivalent keratometry readings (EKR) and anterior corneal simule keratometry (SimK) values following corneal collagen cross-linking (CXL) treatment in keratoconus cases.
METHODS: This study included 42 eyes of 30 patients with progressive keratoconus. Scheimpflug imaging was performed pre-CXL and post-CXL months 6 and 12. The mean Holladay EKR and SimK measurements from 1mm to 7mm were compared. Repeated variance analysis was performed in the statistical evaluation.
RESULTS: The mean age of the patients was 18.93±3.82 years (range, 12 to 27 years). A reduction was observed in the EKR and SimK values at 6 and 12 months postoperatively compared to the preoperative values but the difference was not statistically significant (p>0.05). In the mild keratoconus group, the keratometric measurements were graphically observed to be lower after treatment. In the moderate and severe keratoconus groups, similar measurements were obtained before and after treatment. In 1 patient, there was an increase of >1 diopter (D) in the maximum keratometry (Kmax) value. No complications developed that could lead to vision loss.
DISCUSSION AND CONCLUSION: Corneal collagen CXL treatment is known to be effective to a depth of two-thirds of the anterior corneal stroma. The results of this study showed that Hollday EKR measurements differed from SimK measurement, especially in mild keratoconus. It can be considered that in addition to anterior corneal surface measurements, methods which can evaluate anterior and posterior surface curves could provide more accurate results in progression analysis.

Keywords: cornea, crosslinking, Holladay EKR, Simule Keratometry, Scheimpflug

Corresponding Author: Ayhan Sağlık, Türkiye

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