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Richard Alan Lewis, MD
Houston

Arch Ophthalmol. 1988;106(6):723.

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

To the Editor.

—"O tempora! O mores!" declaimed Cicero as the orator arraigned Catiline for his boldness. Such were my thoughts when I read the correspondence by Brod and Packer¹ in the January 1988 issue of the ARCHIVES that stated that cross-fixational direct stereopsis can be learned easily by nonpresbyopic subjects. Indeed, I have used this simple technique for some years to fuse sequential stereoscopic roentgenographic images, fundus photographs, and fluorescein angiograms.

Alas! I must remind the authors of a grammatical slip in their use of the term chiastopic. Its construction appears to derive from two Greek roots: (1) chiasma, from the 22nd letter of the Greek alphabet, x, which describes two crossing lines and, thus, a cross or decussation, and (2) topos, meaning a spot or place.

A similar construction is seen with the prefixes en- (in, within) and ek- (out of), as in entopic or ectopic. Thus, an . . . [Full Text PDF of this Article]

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