Is 1.5 cm correct??! That seems significant! No wonder my head pounds like its going to blow off. 
1-IMG_20160608_125733.jpg (1.38 MB)
im not sure if you still need a reply but im sure it is. I have a 11 mm so im sure 15 mm is right. ive heard of people with 20+. have you talked about your options with a doctor id love to know what they said. sorry for no caps.