![](http://upload.wikimedia.org/wikipedia/commons/thumb/f/f8/Geraet_beim_Optiker.jpg/300px-Geraet_beim_Optiker.jpg)
Hospital Corpsman Brian Long, of Sellersville, Pa., attempts to read a standard eye chart from twenty feet with the help of an optical refractor aboard the aircraft carrier USS John F. Kennedy (CV 67).
Photo credit: United States Navy
Photo credit: United States Navy