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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!sol.ctr.columbia.edu!emory!wa4mei!ke4zv!gary
- From: gary@ke4zv.uucp (Gary Coffman)
- Newsgroups: sci.space
- Subject: Re: Visual acuity in microgravity
- Message-ID: <1992Jul24.022700.4040@ke4zv.uucp>
- Date: 24 Jul 92 02:27:00 GMT
- References: <9207221207.AA29101@cmr.ncsl.nist.gov>
- Reply-To: gary@ke4zv.UUCP (Gary Coffman)
- Organization: Gannett Technologies Group
- Lines: 23
-
- In article <9207221207.AA29101@cmr.ncsl.nist.gov> roberts@CMR.NCSL.NIST.GOV (John Roberts) writes:
- >
- >-From: ewright@convex.com (Edward V. Wright)
- >-Subject: Re: Visual acuity for MS
- >-Date: 21 Jul 92 22:49:05 GMT
- >-Organization: Engineering, CONVEX Computer Corp., Richardson, Tx., USA
- >
- >-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.
- [munch]
- >Many of the astronauts wear glasses while in orbit. There are ongoing tests
- >of changes in visual acuity in microgravity, but I don't know whether anything
- >definitive has been found yet. I think the current theory is that fluid
- >shift may have some influence on the shape of the eyeball, rather than direct
- >gravitational distortion.
-
- What I'd like to know is how they figure out the prescription. If their
- vision is perfect on Earth, how do they predict how much, and in what
- direction, their vision will change in orbit? Or is there a branch of
- Opti-World on MIR with one hour service?
-
- Gary
-