A study by US researchers published in the September 2011 issue of the Journal of Glaucoma finds that users of the illegal drug cocaine have a 45% increased risk of developing open angle glaucoma, a disease leading to blindness, which they also contract at a much younger age.

http://www.presstv.ir/detail/202411.html
http://journals.lww.com/glaucomajournal/Abstract/2011/09000
/Substance_Use_Disorder_and_the_Risk_of_Open_angle.9.aspx