Fonda G E
Saint Barnabas Low Vision Center, West Orange, New Jersey 07052.
Ann Ophthalmol. 1992 Aug;24(8):303-6.
The high-index Visolett magnifier (index, 1.806) is an optically designed glass paperweight magnifier. It magnifies 2.49x, is 32mm in diameter, nonfocusable, and rests on paper. All Visoletts commercially available are made of crown glass (index, 1.523). The 32mm high-index Visolett has become commercially available recently. The use of high-index material increases the image size by 39%.
高折射率维索莱特放大镜（折射率为1.806）是一种经过光学设计的玻璃镇纸放大镜。它的放大倍数为2.49倍，直径32毫米，不可聚焦，可放在纸张上。市面上所有的维索莱特放大镜均由冕牌玻璃制成（折射率为1.523）。32毫米的高折射率维索莱特放大镜最近已上市。使用高折射率材料可使图像尺寸增大39%。
