Where is the headquarters of Dr. Tan glasses?

In Xiangtan, Hunan. Dr. Tan Xiangtan Dr. Tan Vision Technology Co., Ltd., headquartered in Xiangtan, Hunan, the hometown of great men, is a high-tech company specializing in the research and development and sales of myopia prevention glasses for teenagers. Among them, anti-myopia compound glasses have obtained the national patent, and the anti-myopia compound glasses have been rated as "China scientific and technological innovation products". Dr. Tan's vision company provides the majority of teenagers with glasses that can control myopia without deepening. Dr. Tan signed a contract to control myopia prevention degree compound glasses, and the invalid company refunded and got a pair of glasses for free.