photometric differences among samples, light sources or light detectors (including the human eye). Thus, in the case of two brown panels as shown in Fig. 3, Curves A and B, a pair of Filters C and D could be used so as to cause B to JOURNAL OF THE OPTICAL SOCIETY OF AMERICA flicker while A (the standard) remains entirely constant in hue and brightness. We are much indebted to Mr. James M. Moran for handling all mechanical designing of the flickering filter described above.

SUMMARY Ametropia of the eye can be determined subjectively by having a subject view the moving pattern created by a helium‐neon gas laser. The lens power that eliminates the motion of the pattern is a measure of the refractive error. Compared with the conventional subjective method, this new method indicated that the refractive errors for seven subjects were slightly greater in hypermetropia or less in myopia for 15 of the 25 meridians tested. The sensitivity of the laser method was determined for nine subjects and was found to be a quarter diopter or less for 29 of the 35 meridians tested.

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