Groupon is providing Lenskart gift vouchers at 50% discount. Over and above you can get 20% discount by using the coupon code INDULGE
http://city.groupon.co.in/deals/mumbai/lenskart-4/771507

Steps:
1. visit the above link
2. Select Offer 2 and click Buy Now
3. Login too your Groupon Account
4. Click Do you have a Groupon credit code or promo code? and enter the promo code INDULGE to get 20% off
5. Proceed to pay via Mobikwik wallet to get 5% cash back. (If you are lucky like me, You can find a Rs 100 cash back on screen after payment. If you don’t get Rs 100 cash back and if it was mentioned in the screen, you can raise a ticket to get cash back)