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A Clinical Experiment

MURRAY F. McCASLIN, M.D.

AMA Arch Ophthalmol. 1959;62(3):434-437.

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

This is the report of an experiment conducted in November, 1958, in the Department of Ophthalmology of Falk Clinic, University of Pittsburgh School of Medicine.

The purpose of the experiment was to determine what percentage of refracted patients could detect any difference in their wearing of genuinely first-quality lenses versus their wearing of lenses of substandard quality, or "second quality."

Because a lens may be pronounced substandard, or second quality, for any one or more of several reasons (weak or strong in power, malpositioned optical center or axis, scratches, incomplete polish, bubbles, aberration due to striae, aberration due to "invisible" grooves in one or both surfaces of the lens), the one factor tested in the subject experiment was that of aberration due to "invisible" grooves on the concave surface of the glass lenses. Except for that . . . [Full Text PDF of this Article]

Author Affiliations
Pittsburgh

Professor of Ophthalmology, Chairman of the Department, University of Pittsburgh School of Medicine.

Footnotes
Submitted for publication Jan. 14, 1959.

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