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April 1988

Perimetric Threshold Variability and Age-Reply

Arch Ophthalmol. 1988;106(4):451-452. doi:10.1001/archopht.1988.01060130492015

In Reply.  —We are delighted that Heijl and coworkers1 have confirmed, in an entirely different population, many of our previous observations2,3: that threshold and intratest variability increase with increasing eccentricity; that they vary with location; and that the slope of the hill of vision increases with age. Their letter presents additional data that conflict with our observation3 that the variability of

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