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J. Van Dyke Quereau, M.D.

Arch Ophthal. 1941;26(2):291-292.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

The instrument consists of a metal divider 5 cm. wide, which when slid over the edge of a reading card, as in the accompanying illustration, projects about 20 cm. in front of the card and divides the print into two

Instrument for testing vertical muscle balance at reading distance. equal columns. The width of the divider is such that it obscures the left column from the patient's right eye, so that the right eye sees only the right column. The left eye likewise sees only the left column. If any hyperphoria is present the column of print seen by the hyperphoric eye will appear lower than that seen by the opposite eye. The amount of prism base down before the hyperphoric eye which will bring both columns to the same level is the measure of the amount of hyperphoria present under normal reading conditions.

The first advantage of a test . . . [Full Text PDF of this Article]

Author Affiliations
Reading, Pa.

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