The modern "5A" shape was designed by Rochester Optical, who is the exclusive manufacturer of the R-5A frame. The brown cellulose acetate frames were discontinued in 2012, and a new smaller unisex lens shape, the "5A", was introduced, with a black frame. Black "S9" frames were released for a brief period, before brown cellulose acetate replaced the black. In the late 1970s, the lens shape was re-designed to the "S9". The replacement frames used black cellulose acetate. Initially gray cellulose acetate was used, but this was discontinued in 1968, with remaining stocks issued until exhausted. Īfter World War II, the material was switched from nickel alloy wire to cellulose acetate. The design was a modification of the style used by the British military. It was wire-rimmed with cable temples and a "P3" lens shape. The original version was designed for use with gas masks during World War II. Similar glasses (without metal) can be issued to inmates in state and federal prisons. At times in the US Navy they were called to " Standard Navy Ugly Glasses" ( SNUGs). This was commonly said to mean "rape prevention glasses" due to their unstylish appearance. At one time, they were officially designated as regulation prescription glasses ( RPGs). Dysphemisms for them include the most common " birth control glasses" ( BCGs) and other variants. GI glasses are eyeglasses issued by the American military to its service members. Eyeglasses issued by the American military to its service members GI glasses, gray cellulose acetate, 1960s design Army issue glasses from the mid 1980s Male S9 ("MS9") GI glasses, 1990s design Female S9 ("FS9") GI glasses Model "5A" GI glasses, 2012 design
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