Fig. 4From: Inverted internal limiting membrane-flap technique for large macular hole: a microperimetric studyFixation stability changes. The Bivariate Contour Ellipse Area (BCEA) values have been applied to obtain a quantitative measure of fixation stability. We analysed BCEA which contains 68%, 95% and 99% of fixation points. BCEA significantly decreased at all follow-upBack to article page