Astronaut Rick Mastracchio's flown Superfocus eyeglasses kit used aboard the International Space Station during Expedition 38/39, including two hardshell cases signed and flight-certified in black felt tip inside the upper lids, "Flown, RM." One case holds the pair of tortoiseshell-colored eyeglasses, and the other has magnetic holders for three attachments. Both have labels on the lids, reading: "CP-3-TF-Mt-E39" (Mt for Mastracchio, E39 for Expedition 39). These adjustable-strength glasses were used by long duration crews on orbit to compensate for the changes of the eyes over time. In fine condition, with light wear from use. Accompanied by a letter of provenance from Astronaut Rick Mastracchio. From the collection of astronaut Rick Mastracchio, who flew on STS-106, STS-118, STS-131, and Soyuz TMA-11M (Expedition 38/39).
