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A REFINEMENT OF REFRACTION

HENRY L. BIRGE, M.D., M.S. (Ophth.)

Arch Ophthal. 1942;27(2):357-360.

	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 introduction of aniseikonic lenses has not changed the cardinal points of refraction. The chief aim of the refractionist is still to relieve asthenopia and to prescribe glasses as seldom as possible.

Much of the fundamental knowledge about aniseikonia has been known but unused for many years.¹ Out of recent studies has come a method of measuring and correcting errors in the size and shape of the ocular images so sensitive that existing errors may be corrected to the limits of observation. The latest method (with the American Optical eikonometer) is simple and rapid in most cases, and the aniseikonic glasses do not differ greatly in appearance from ordinary power lenses. The average person with 20/20 vision is able to recognize repeatedly differences of 0.25 per cent in the size of the ocular images, while the astute observer may note differences of 0.10 per cent.²

Few clinicians care . . . [Full Text PDF of this Article]

Author Affiliations
HARTFORD, CONN.

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