one of the ways of selling products is “direct selling”. the companies which use this method sell their products directly to end users just by their distributors’ intermediation. in this method, distributors retail sell the products out of a fixed commercial location. harmful effect of loading unsold products with distributors had legislators make companies buy-back those products. briefly, we ...

iran enjoys a glorious history in medicine, ophthalmology and optics and has introduced several great physicians and ophthalmologists to the world. the history of ophthalmology dates back to 6000 years ago; unfortunately we have no manuscripts or petrographies from those eras. the oldest document about ophthalmic diseases can be found in avesta. furthermore, as early as 1600 years ago, genta sh...

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