The Pyongyang Optical Technology Company is in Sojang-dong, Pothonggang District of Pyongyang. Its President Kim Sang Ju has been known as an expert in spectacles.
He has been working at the company since it was established. He has a profound knowledge of different fields including optics, materials science, industrial art, manufacturing technology, aesthetics and commerce, to say nothing of ophthalmology.
His life is said to have gone with more than 30-year-long history of the company.
He has kept a doctoral thesis dealing with the standard design of spectacles shop, the establishment of spectacles manufacture and sale service systems and the scientific system of spectacles service.
The thesis gives perfect answers to the theoretical and practical issues arising in the establishment of the spectacles service system of Korean style.
In March and October Juche 105 (2016) the respected Comrade Kim Jong Un called at the spectacles counter of the Mirae Shop and the spectacles shop of the Ryugyong General Ophthalmic Hospital and gave specific instructions concerning the sale of spectacles to the people.
Kim Sang Ju met Kim Jong Un on two occasions and received precious instructions from him. He completed the thesis opening up a new path of the spectacles field on the basis of the instructions.
He is working hard with all his wisdom and passion, guided by the instructions of Kim Jong Un.