File:1941 - 10 16 Dr Field to Clara Hinderer Baur.jpg

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source:Clara Hinderer collection.

Northwestern University Medical School

Department of Ophthalmology

Ward Memorial Building

Chicago, Illinois

October 16, 941

Mrs. A. Baur

Watertown,

Wisconsin

'Dear Mrs. Baur: Re: Your son Ralph Baur

Examination of your son, Ralph, failed to sow any evidence of aniseikonia<ref> Aniseikonia is a condition that results from an excessive difference in the prescription between the eyes. This causes a difference in image size perceived between the eyes from unequal magnification, and can manifest with symptoms of headache, dizziness, disorientation, and excessive eye strain.</ref>. However, he does have a very unstable fusional amplitude <ref>The prism fusion range (PFR) or fusional vergence amplitude is a clinical eye test performed by orthoptists, optometrists, and ophthalmologists to assess motor fusion, specifically the extent to which a patient can maintain binocular single vision (BSV) in the presence of increasing vergence demands.</ref>. Because of this pronounced difficulty in using his two eyes together we think it essential that he pursue fusional exercises on certain orthoptic equipment. Accordingly we gave him a report and recommended he consult Miss Deborah Dicke at Children's Hospital in Milwaukee for this work, since this is the closest registered orthoptist to his school.

Glasses of any type will not give Ralph relief until this fusion difficulty is overcome. If we can be of any further service we shall be very glad to do so.

Very truly yours,

Homer B. Field, M.D.

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Divergence Therapy

note: On the back of the letter a notation is made. "Paid $25 Nov. 18, 1941.