Abstract
Abstrakt Corneal viscoelastic properties in patients with subclinical keratoconus I.V. Dutchin, E.L. Sorokin, Yu.V. Kutuzova, Ia.E. Pashentsev Fyodorov Eye Microsurgery Federal State Institution, Khabarovsk Branch, Khabarovsk, Russian Federation Far-Eastern State Medical University, Khabarovsk, Russian Federation Purpose. To evaluate corneal viscoelastic properties in subclinical keratoconus (SKC), analysis of its association with corneal thickness, and degree of risk of iatrogenic corneal ectasia. Material and methods. The main group consisted of 21 patients with signs SKC according to Pentacam (Oculus, Germany). The control group consisted of 21 patients without signs of subclinical SKC. In both groups, moderate myopia prevailed; groups were comparable in age and gender. A comparative statistical analysis of parameters of topography system Pentacam and corneal viscoelastic properties using the Corvis ST (Oculus, Germany) was carried out. Results. In the main group, the values: Corneal Applanation Velocity1, the Deformation Amplitude, and the Tomographic and Biomechanical Index (TBI) were statistically significantly higher compared to the control group. The values of the radius and the corneal central thickness, on the contrary, had statistically significantly lower values than in the control group. According to the values of the TBI (from 0 to 0.28), in the control group there was a «no obvious risk» of postoperative ectasia. In the main group, the average value of the TBI (0.43) was much higher than in the control group, which indicates weakened protective frames of cornea and risk of iatrogenic corneal ectasia in case of refractive surgery. There was no relationship between corneal thickness and TBI in the main group: r= –0.34 (p=0.13). Despite the signs of SKC in the main group, according to Pentacam, in 74% of eyes the corneal viscoelastic properties had sufficient rigidity for keratorefractive surgery. Conclusion. When selecting patients for keratorefractive surgery, along with assessing the parameters of corneal topography, it is also necessary to evaluate the corneal viscoelastic properties. Key words: subclinical keratoconus; fruste keratoconus; corneal viscoelastic properties, corneal biomechanical properties; iatrogenic corneal ectasia
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