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据美国弗罗斯特和沙利文公司题为“美国折射和衍射光学元件市场”的报告报道,美国1991年透镜市场为2.90亿美元,预计到1996年将上升到3.88亿美元;棱镜1991年为2500
According to a report by Frost & Sullivan of the United States entitled “Americal refractive and diffractive optical element market ”, the lens market in the United States was 290 million U.S. dollars in 1991, and is expected to rise to 388 million U.S. dollars by 1996; Prism 1991 was 2500