Where to buy Clip On Lens in India?

[Sai]

Clip-on lens, a dark sunglasses lens that can be clipped onto corrective eyewear

Where can I get it in India?. Not available in LensKart.
I am looking for something similar to this

Not this type

 

[Sai]

Searched for couple of hours. But unable to find proper ones in India. Anyone know where to get Fitover glasses?.

Last option is to ask a relative to send from US.