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The visual changes in MPD illustrate the fact that many conditions of the
eye that are conventionally conceived to be permanent conditions are merely
functional disorders. Optometrists Birnbaum and Thomann cite several
observations and studies and conclude:

Among the most intriguing characteristics of MPD patients are the
physiologic differences demonstrated in different personality states.
Differences in ocular visual status in alter personality states have been
reported with respect to visual acuity, manifest refration, pupil size,
corneal curvature, intraocular pressure, binocular alignment, visual
fields, and color vision. The most dramatic findings include the existence
of personality-specific strabismus, and in the case reported in this paper,
personality -specific hemianopsia and refractive differences in alter
personalities of suffient magnitude to require the use of different glasses.

...

The existence of personality-specific physiologic differences, including
differences in visual and ocular status, offers a unique and intriguing
potential for better understanding of the manner in which personality and
mental state may influence physiology and be factors in vision disorder and
disease.

Birnbaum, Martin, O.D. and Kelly Thomann, O.D. "Visual function in multiple
personality disorder." Journal of the American Optometric Association. 67(6)