The effect of corneal crosslinking on the rigidity of the cornea estimated using a modified algorithm for the Schiøtz tonometer

Purpose: The aim of this study was to test a method for estimating corneal rigidity before and after cross-linking (CXL) using a Schiøtz tonometer. Methods: The study was performed in the Kyiv City Clinical Ophthalmological Hospital "Eye Microsurgical Center", Ukraine. This was a prospecti...

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Vydané v:Indian journal of ophthalmology Ročník 69; číslo 6; s. 1531 - 1536
Hlavní autori: Tutchenko, Larysa, Patel, Sudi, Skovron, Mykhailo, Horak, Olha, Voytsekhivskyy, Oleksiy
Médium: Journal Article
Jazyk:English
Vydavateľské údaje: India Wolters Kluwer - Medknow 01.06.2021
Medknow Publications and Media Pvt. Ltd
Medknow Publications & Media Pvt. Ltd
Wolters Kluwer Medknow Publications
Vydanie:2
Predmet:
Algorithms
Care and treatment
Cornea
Corneal diseases
cxl
Eye
Keratoconus
Lasers in surgery
Medical examination
Methods
Patient outcomes
Physiological aspects
rigidity
schiøtz tonometer
Special Focus on Ocular Surface and Cornea
Statistical analysis
Surgery
Tonometry
Ukraine
Schiøtz tonometer
Cornea
rigidity
CXL
ISSN:0301-4738, 1998-3689, 1998-3689
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Shrnutí:Purpose: The aim of this study was to test a method for estimating corneal rigidity before and after cross-linking (CXL) using a Schiøtz tonometer. Methods: The study was performed in the Kyiv City Clinical Ophthalmological Hospital "Eye Microsurgical Center", Ukraine. This was a prospective, consecutive, randomized, masked, case-by-case, clinical study. Corneal rigidity, indicated by the gradient (G) between lg applied weight and corresponding lg scale reading during Schiøtz tonometry, were obtained by increasing (A-mode) then reducing (D-mode) weights by two operators [A] in keratoconus, post-CXL and control subjects for estimation of (i) interoperator and (ii) intersessional errors, (iii) intergroup differences; [B] before and after CXL. Central corneal thickness CCT was measured by scanning slit pachymetry. ANOVA, t tests, linear regression were the statistical tools used. Results: Average interoperator difference (ΔG) was -0.120 (SD = ±0.294, 95%CI = -0.175 to -0.066). A significant correlation between ΔG and the mean of each pair of G values was found (r = -0.196, n = 112, P = 0.038). Intersessional differences in mean G values were insignificant (P > 0.05). There was a significant correlation between G at first session (X1) and difference between sessions (ΔG) [Operator 1, ΔG = 0.598x1-0.461, r = 0.601, n = 27, P = 0.009]. Significant intergroup differences in G were found (Operator 1, one-way ANOVA, F = 4.489, P = 0.014). The difference (Δ) between the pre-(X2) and post-CXL treatment G values was significantly associated with the pre-CXL treatment value (Operator 1, Δ = 1.970x2-1.622, r = 0.642, n = 18, P = <.001). G values were correlated with CCT in keratoconus and post-CXL. Conclusion: Corneal rigidity (G) estimated using the Schiøtz tonometer can be useful for detecting changes after CXL. However, G values are linked to CCT, can vary from time-to-time and the procedure is operator dependent.
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ISSN:0301-4738
1998-3689
1998-3689
DOI:10.4103/ijo.IJO_1820_20