Are astronauts allowed to wear their eyeglasses inside their helmets during launches and landings?? Are there any special considerations or rules?
During spaceflight (launches and landings) there can be a lot of vibrations that could knock eyeglasses off of an astronaut's nose. If contained inside a helmet, it may be difficult to put them back on straight. Improperly positioned might seriously obstruct vision, produce distracting pain, or even pose a potential risk of injury.
I noticed in the photos below that while both astronauts Donald Pettit and Andre Kuipers were wearing glasses while seated in the re-entry vehicle before closing the hatch, only one of them appeared to be wearing glasses upon re-entry, landing, and being removed from the capsule. *Did Astronaut Kuipers' glasses fall off, or did Astronaut Pettit remove his glasses just before descent?
Can eyeglasses just come from the local optician, or are special space-rated astronaut frames and/or lenses required?
above: Astronauts Donald Pettit, Oleg Kononenko and Andre Kuipers preparing to return to Earth. From NASA Letters to Earth June 17-26 – Diary of a Space Zucchini. If you right-click and open in a separate window for a larger view you can see that two of the three are wearing eyeglasses.
above x2: Astronaut Pettit seems to have his eyeglasses still on after re-entry and landing. From The Daily Mail.
above: However, astronaut Kuipers does not seem to be wearing his eyeglasses after re-entry and landing. From The Daily Mail.
below x2: Astronaut Pettit wearing his eyeglasses during his daily, routine activities on board the ISS. Top: Self Portrait, from Popular Science. Credit Don Pettit/NASA, Bottom: From NASA Letters to Earth Lost Chopstick.
below: Astronaut Pettit in 2002 on STS-113, wearing a substantially different style of eyeglasses with much larger frames. From STS-113 Shuttle Mission Imagery (ISS006-E-05004).