Dear Kuba Ober,
The coil is annulus-shaped and does NOT cover the pupil of the eye.
Therefore, the video system observes the pupil through the cornea alone and
not through the coil. Hence, the location of the pupil as seen by the video
system is not affected by the coil with respect to its possible prismatic
effect.
You could have a point when we had used a video system that tracks corneal
reflections as well.
All the best,
Jos van der Geest
At 01:42 PM 7/25/02 -0400, Kuba Ober wrote:
> > In the second paper (J Neurophys, in press) we show that coils affect the
> > dynamics of saccadic eye movements. A preprint of this paper is at
> >
> > http://www.eur.nl/fgg/neuro/people/frens/coils.pdf
>
>This article seems to lack a paragraph about prismatic effect of the eye coil
>(its optical thickness is nonzero, after all), and a mention of the magnitude
>of such effect, to show whether it can be accountable for anything, or not.
>
>The video system observes the pupil through the cornea *and* the eye coil, so
>the location of the pupil as seen by the video system *is* affected by the
>coil, depending on its thickness and profile.
>
> From what I gather from the article, the system was calibrated with the
> coils
>on the subject, so this may be purely academic, yet I think that some
>discussion of this, or some references to papers where this effect might be
>mentioned, would be in order.
>
>Cheers, Kuba Ober
--
EYE-MOVEMENT mailing list ([log in to unmask])
N.B. Replies are sent to the list, not the sender
To unsubscribe, etc. see http://www.jiscmail.ac.uk/files/eye-movement/introduction.html
Other queries to list owner at [log in to unmask]
|