NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Eye problems and IE, IC
From: Bill B
Date: 2006 Jul 13, 23:02 -0500
Second and third of batch of several tests run today.
This post contains vertical vs horizontal tests with both eyes, on and off
the arc, and should help determine if the horizontal readings differ due to
frame/mirror movement in the horizontal position, and/or if my eye(s) are at
fault.
I was pleasantly surprised with the precision of the right eye vertical and
some of the horizontal observations. Others were very disappointing. I
would have to redo the tests IMHO to obtain more precise figures for use in
any correction factor.
I did note the right-eye horizontal 4SD was over, which is extremely rare
for me, but given the STDV of the on-the-arc shots, not to be given too much
weight.
The right eye observations were made first, then the left eye control
observations. Order of operations within an eye batch were random.
*IF* changing focus can change IE, left and right eye IE's cannot be
meaningfully compared.
Dark colored shirts should not be worn on a hot day when doing marathon
observations. <G>
HORIZONTAL RIGIDITY & EYE-TO-EYE TESTS
Astra IIB, Star Scope
13 July, 2006
Right eye 15:45 to 16:03 EDT
Hc 60d to 57d
Left eye 16:03 to 16:25 EDT
Hc 57d to 53d
Key:
VON (vertical on the arc)
VOF (vertical off the arc)
HUDON (horizontal on the arc)
HUDOF (horizontal of the arc)
STDV (standard deviation)
RIGHT EYE
Vertical Vertical Horiz Horiz
On Arc Off arc On Arc Off Arc
31.3 28.4 32.2 HU 29.0 HU
31.5 28.4 32.2 HD 29.0 HD
31.4 28.5 31.9 HU 29.0 HU
31.4 28.3 32.6 HD 28.9 HD
31.2 28.6 32.4 HU 29.0 HU
31.3 28.4
31.4 28.4
Mean Standard Deviation
VON 31.36' 0.098'
VOF 28.43' 0.095'
60-VOF 31.57' -----
HUDON 32.26' 0.26'
HUDOF 28.98' 0.045'
60-HUDOF 31.02' -----
TARGET 4SD: 63.2'
Vertical 4SD: 62.93
Horizontal 4SD: 63.28
Vertical IE: 0.11' Off
Horizontal IE: 0.62' On
LEFT EYE
Vertical Vertical Horiz Horiz
On Arc Off arc On Arc Off Arc
31.9 28.8 31.3 HU 28.4 HU
32.0 29.0 31.3 HD 28.3 HD
31.9 28.9 31.4 HU 28.4 HU
32.0 28.9 31.5 HD 28.4 HD
31.8 29.0 31.4 HU 28.4 HU
31.9 29.1 31.4 HD 28.4 HD
31.9 29.0 31.3 HU 28.4 HU
Mean Standard Deviation
VON 31.91' 0.069'
VOF 28.96' 0.098'
60-VOF 31.04' -----
HUDON 31.38' 0.076'
HUDOF 28.39' 0.038'
60-HUDOF 31.61' -----
TARGET 4SD: 63.2'
Vertical 4SD: 62.96
Horizontal 4SD: 62.99
Vertical IE: 0.44' On
Horizontal IE: 0.12' Off
____________________________________
RECAP
LEFT EYE RIGHT EYE DIFF
VON 31.91' 31.36 0.55'
VOF 31.04' 31.57' -0.53
HUDON 31.38' 32.26' -0.98
HUDOF 31.61' 31.02' 0.59
CONCLUSION
I would like to see tighter clusters/lower STDV in some of the observations.
It was hot, my arm became tired, and at times I lost the ability to clearly
focus. At these times I took a five minute break. There were also "cloud
cover" breaks.
Words like disappointed, hot, tired pleasantly and surprised do not belong
in scientific writing. The rat was not hungry, it was deprived of food for
three days. The rat did not stop pressing the bar for food pellets (when
each press produced a pellet) because it was full or content, the rat was
satiated.
Along that line, the observer was perspiring, and reported fatigue and some
loss of motor control in his right arm. He also reported the inability to
focus clearly on the two images after 10 minutes or more of observation.
The experimenter cautions that the relationships between vertical and
horizontal measurement change as the body rises or drops in relationship to
the horizon. Therefore changes in elevation of the body will affect the
vertical to horizontal ratio. Care should be taken when comparing
observations taken at different times/elevations. The experiment was
designed to maintain body elevations in a region that minimize these
distortions.
Data for error calculation should done with the body near maximum elevation,
and data groups with greater than one (1) standard deviation off, or greater
than 0.3' off published semi-diameter (after interpolation if warranted)
should be rejected.
Noting the above, the data supports the hypothesis that frame flex or mirror
movement due gravity, either in vertical or horizontal position, is not
responsible for the magnitude of change from vertical to horizontal. The
theory that astigmatism in both eyes, working at cross purposes, appears to
be the most plausible explanation at this point.
"Wooly" Bill
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To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
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From: Bill B
Date: 2006 Jul 13, 23:02 -0500
Second and third of batch of several tests run today.
This post contains vertical vs horizontal tests with both eyes, on and off
the arc, and should help determine if the horizontal readings differ due to
frame/mirror movement in the horizontal position, and/or if my eye(s) are at
fault.
I was pleasantly surprised with the precision of the right eye vertical and
some of the horizontal observations. Others were very disappointing. I
would have to redo the tests IMHO to obtain more precise figures for use in
any correction factor.
I did note the right-eye horizontal 4SD was over, which is extremely rare
for me, but given the STDV of the on-the-arc shots, not to be given too much
weight.
The right eye observations were made first, then the left eye control
observations. Order of operations within an eye batch were random.
*IF* changing focus can change IE, left and right eye IE's cannot be
meaningfully compared.
Dark colored shirts should not be worn on a hot day when doing marathon
observations. <G>
HORIZONTAL RIGIDITY & EYE-TO-EYE TESTS
Astra IIB, Star Scope
13 July, 2006
Right eye 15:45 to 16:03 EDT
Hc 60d to 57d
Left eye 16:03 to 16:25 EDT
Hc 57d to 53d
Key:
VON (vertical on the arc)
VOF (vertical off the arc)
HUDON (horizontal on the arc)
HUDOF (horizontal of the arc)
STDV (standard deviation)
RIGHT EYE
Vertical Vertical Horiz Horiz
On Arc Off arc On Arc Off Arc
31.3 28.4 32.2 HU 29.0 HU
31.5 28.4 32.2 HD 29.0 HD
31.4 28.5 31.9 HU 29.0 HU
31.4 28.3 32.6 HD 28.9 HD
31.2 28.6 32.4 HU 29.0 HU
31.3 28.4
31.4 28.4
Mean Standard Deviation
VON 31.36' 0.098'
VOF 28.43' 0.095'
60-VOF 31.57' -----
HUDON 32.26' 0.26'
HUDOF 28.98' 0.045'
60-HUDOF 31.02' -----
TARGET 4SD: 63.2'
Vertical 4SD: 62.93
Horizontal 4SD: 63.28
Vertical IE: 0.11' Off
Horizontal IE: 0.62' On
LEFT EYE
Vertical Vertical Horiz Horiz
On Arc Off arc On Arc Off Arc
31.9 28.8 31.3 HU 28.4 HU
32.0 29.0 31.3 HD 28.3 HD
31.9 28.9 31.4 HU 28.4 HU
32.0 28.9 31.5 HD 28.4 HD
31.8 29.0 31.4 HU 28.4 HU
31.9 29.1 31.4 HD 28.4 HD
31.9 29.0 31.3 HU 28.4 HU
Mean Standard Deviation
VON 31.91' 0.069'
VOF 28.96' 0.098'
60-VOF 31.04' -----
HUDON 31.38' 0.076'
HUDOF 28.39' 0.038'
60-HUDOF 31.61' -----
TARGET 4SD: 63.2'
Vertical 4SD: 62.96
Horizontal 4SD: 62.99
Vertical IE: 0.44' On
Horizontal IE: 0.12' Off
____________________________________
RECAP
LEFT EYE RIGHT EYE DIFF
VON 31.91' 31.36 0.55'
VOF 31.04' 31.57' -0.53
HUDON 31.38' 32.26' -0.98
HUDOF 31.61' 31.02' 0.59
CONCLUSION
I would like to see tighter clusters/lower STDV in some of the observations.
It was hot, my arm became tired, and at times I lost the ability to clearly
focus. At these times I took a five minute break. There were also "cloud
cover" breaks.
Words like disappointed, hot, tired pleasantly and surprised do not belong
in scientific writing. The rat was not hungry, it was deprived of food for
three days. The rat did not stop pressing the bar for food pellets (when
each press produced a pellet) because it was full or content, the rat was
satiated.
Along that line, the observer was perspiring, and reported fatigue and some
loss of motor control in his right arm. He also reported the inability to
focus clearly on the two images after 10 minutes or more of observation.
The experimenter cautions that the relationships between vertical and
horizontal measurement change as the body rises or drops in relationship to
the horizon. Therefore changes in elevation of the body will affect the
vertical to horizontal ratio. Care should be taken when comparing
observations taken at different times/elevations. The experiment was
designed to maintain body elevations in a region that minimize these
distortions.
Data for error calculation should done with the body near maximum elevation,
and data groups with greater than one (1) standard deviation off, or greater
than 0.3' off published semi-diameter (after interpolation if warranted)
should be rejected.
Noting the above, the data supports the hypothesis that frame flex or mirror
movement due gravity, either in vertical or horizontal position, is not
responsible for the magnitude of change from vertical to horizontal. The
theory that astigmatism in both eyes, working at cross purposes, appears to
be the most plausible explanation at this point.
"Wooly" Bill
--~--~---------~--~----~------------~-------~--~----~
To post to this group, send email to NavList@fer3.com
To , send email to NavList-@fer3.com
-~----------~----~----~----~------~----~------~--~---
