Studies on ocular rigidity

: An ophthalmo-sphygmographic method for assessment of ocular rigidity is suggested. Rigidity coefficient E is estimated from changes in intraocular pressure and eye volume connected with systolic increment of blood volume. The mean E value in normal subjects (n = 123) was 0.0214 +/- 0.005. The results of the suggested method for E coefficient assessment and Friedenwald's method were in good correlation (r = 0.72). Use of Schiotz's constant weight impression sensor helped do without differential tonometry and therefore simplify the method and rule out the errors typical of the traditional methods.