T3D Re: Interocular question

["Kersenbrock, Michael" <michaelk@xxxxxxxxxxx>]

John W Roberts wrote:
>
>  1) Face your reflection directly in a mirror.
> 
>  2) "Parallel view" your eyes, so that the image of the two eyes is merged
>     to form an image of a third eye in the mirror. (This orients your eyes
>     so that the axes of view are parallel.)
> 
>  3) Take two pens or other identical pointed objects, and hold the points
>     up against the surface of the mirror.
> 
>  4) Move the two pens so they also form a merged image in the mirror, with
>     the merged point exactly over the center of the pupil of the merged eye
>     image. Hold the pens there.
> 
>  5) Using a ruler, measure the distance between the two pen points. (You can
>     have someone else take the measurement, or perform the experiment with the
>     pens placed along the edge of a ruler, and just read the distance on
>     the ruler.)
> 
> The distance measured should match the interpupillary distance with
> convergence at infinity.
> 
> Comments?

How about just standing near a window looking at a distant
mountain top (something at "infinity") and have someone put
a ruler across your nose and just measure the eyes directly?

Mike K.

> 
> John R


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