Biomechanical properties of the cornea in Floppy eyelid syndrome

Abstract

Purpose: To determine corneal biomechanical properties in patients with floppy eyelid syndrome
 Methods: The study included 40 patients (54 eyes) with hyper-extensible eyelid syndrome. The average age was 53.9 6.7 years. The central corneal thickness averaged 551 25. All patients underwent standard ophthalmological examination, including pneumotonometry. Intraocular pressure (IOP) and biomechanical properties of the cornea were measured using dynamic bidirectional applanation.
 Results: Study of the biomechanical properties of the cornea in patients with Floppy eyelid syndrome showed a decrease in corneal hysteresis (CH) indices on average to 9.96 0.61 mm Hg, corneal resistance factor (CRF) - to 9.54 0.64 mm Hg. Moreover, their value varied depending on the severity of the syndrome. The mean value of corneal compensated IOP (IOPcc) in the entire sample was 15.5 1.0 mm Hg, Goldman IOP (IOPg) 15.1 2.0 mm Hg, pneumotonometric IOP 11,61 2.9 mm Hg. Regardless of the severity, the pneumotonometric IOP indices did not have statistically significant differences, while as this syndrome progressed, the IOPcc and IOPg indices showed a steady decrease in the mean values.
 Conclusions: It was found that in the Floppy eyelid syndrome the biomechanical parameters of the cornea were reduced. At the same time, the value of these indicators varied significantly from the severity. The largest decrease was demonstrated by the corneal hysteresis index, and the smallest corneal-compensated IOP.