—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
Sommer A, Katz J. Perimetric Threshold Variability and Age-Reply. Arch Ophthalmol. 1988;106(4):451–452. doi:10.1001/archopht.1988.01060130492015
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