The mean angle-opening distance at 500 microns from sclera spur ( AOD500 ) measured by UBM was significantly increased from 220.393.8 microns to 388.9134.1 microns ( p < 0.001 ) by clear lens extraction , but decreased from 220.979.8 microns to 214.570.2 microns ( p = 0.11 ) by trabeculectomy .