Significance of corneal rigidity at measuring of intraocular pressure

Abstract

AbstractPurposeTo optimize tactics of determination of IOP for emmetropic and myopic eyes by application a correction to the coefficient on cornea rigidity (KER).MethodsThe 160 myopic and 80 emmetropic eyes were included in the study. All eyes were examined with the methods of the measuring of cornea rigidity in vivo (Sergienko N.M., Shargorodska I.V. 2013).ResultsThe results showed no dependence of cornea rigidity was educed from the cornea central thickness (r = 0.04) and sagital front‐back size of eyes for all inspected patients (r = 0.12). Cross‐correlation dependence between these indexes was statistically not reliable (p > 0.05). The results of analysis testified to high the degree of dependence of coefficient cornea rigidity from age and sex of patient (r = 0.53 and r = 0.59 accordingly, p < 0.05), refraction (r = 0.77, p < 0.05), spherical equivalent (r = 0.79, p < 0.05). The most strong cross‐correlation dependence was educed between KER and degree of curvature of cornea in a «steep» meridian (r = 0.78, p < 0.05), elevation of back cornea surface of (r= 0.93, p < 0.05) and exentrisite (r = 0.87).ConclusionThe cornea rigidity index are forward as an integral index that takes into account influence of different factors: age, sex, clinical refraction, spherical equivalent and others. Using of cornea rigidity index for measuring of level IOP will allow more exactly to estimate, removing influence of central cornea thickness on level IOP.ReferencesThe problem of study of biomechanics properties of cornea a long ago attracts attention researchers (Perkins E.S., 1981; Phillips J.R., 1990; Iomdina E.N., 2006; Svetlova O.V., 2010). The functional features of co‐operation of biomechanical properties of cornea with other eye regulator systems of eye can play substantial influence on exactness to measuring of ophthalmotonus (Young F.A., Leary G.A., 1991; Koshitz I.N., 2001).