I had to stop using it for a while. All the lifting my arms up and leaning forwards to look closely in the mirror caused a major flare up in my neck and shoulder problems and a four day headache!
I now have to apply it lying on the sofa holding the mirror and mascara base in one hand and the wand in the other. That way my head, neck and arms are supported and I have a bright LED light overhead which helps. Less likely to remember to do it though. It is definitely making my lashes easier to spot - just - but it is not the best mascara I have used. It tends to clump a bit although I have an eyelash comb which helps - or it could just be I am cack-handed at applying it!