Verifiy your student status and get your 15% voucher code for glasses which you can redeem here:

The voucher code will be sent to your e-mail address.

ISIC serial number
E-mail address
Your e-mail address is used only for delivery of your voucher and will not be used for any other purpose unless permission is given.
Your name (as stated on your card)
  I agree for ISIC Association to use my e-mail address for the purpose of market research.
  I agree with the Privacy Policy