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- Newsgroups: sci.space
- Path: sparky!uunet!cs.utexas.edu!convex!convex!ewright
- From: ewright@convex.com (Edward V. Wright)
- Subject: Re: Visual acuity for MS
- Message-ID: <ewright.711758945@convex.convex.com>
- Sender: usenet@news.eng.convex.com (news access account)
- Nntp-Posting-Host: bach.convex.com
- Organization: Engineering, CONVEX Computer Corp., Richardson, Tx., USA
- References: <1992Jul16.215326.9130@news.larc.nasa.gov> <BrIoI2.Fz3@zoo.toronto.edu> <Brr7K9.BGn@zoo.toronto.edu>
- Date: Tue, 21 Jul 1992 22:49:05 GMT
- X-Disclaimer: This message was written by a user at CONVEX Computer
- Corp. The opinions expressed are those of the user and
- not necessarily those of CONVEX.
- Lines: 32
-
- In <Brr7K9.BGn@zoo.toronto.edu> kcarroll@zoo.toronto.edu (Kieran A. Carroll) writes:
-
- >Good point. One practical use of such a requirement, however, might
- >be to provide a guideline for deciding when an active astronaut
- >should retire. A number of the astronauts wear glasses on-orbit;
- >likely many of them due to deteriorating eye-sight as they grow
- >older. Even if all new-hires had 20-20 uncorrected vision, once they're
- >in their 40's it'd start getting worse. The requirement may apply
- >less to new-hires than to old hands.
-
- On the contrary, the requirements are for new hires are much stricter
- than the requirements for old hands. NASA, like the USAF, requires
- *uncorrected* 20/20 for all pilot candidates, but a number of pilot
- astronauts (including John Young, who was head of the astronaut office)
- started wearing glasses as they got older. To the best of my knowledge,
- none were ever dropped from the program because of deteriorating vision.
-
- Requirements for perfect uncorrected vision are pretty silly;
- the chances of a pilot having to fly with uncorrected vision
- are pretty remote. (There are many thousands of civilain pilots
- with less-than-perfect vision, and I have never heard of a plane
- crashing as a result.) But NASA wants to maintain the image of
- astronauts as physically perfect supermen and women for public-
- relations purposes.
-
- As a side note, even astronauts with perfect vision (on Earth)
- usually wear contact lenses on orbit because the shape of the
- eyeball changes when there is no gravity to distort it.
-
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