Also please make a note that out of the 10 designs that you bring only 5 might be sold. How many frames you like when you go to an optician? Same thing applies to your customers. Most of your stock will go waste so to cover the cost opticians charge so high.

As this is a credit intensive business how long can you give credit to your customers(small opticians)? Will you buyback unsold stock?

I would suggest you try something that you are master at.