Topic: Optical--Sort Of
"NASA is evaluating a new type of adjustable eyeglass lens called TruFocals for use during training and on missions. For the past six months NASA has been taking TruFocals (made by Van Nuys, Calif.–based Zoom Focus Eyewear, LLC) through a detailed certification process to ensure they are not only a better option than other types of eyeglasses," according to ScientificAmerica.com. The article discusses the Lost in Space sensations presbyops feel at zero gravity with traditional eyewear.
