In Reply Downie and Vingrys believe that our findings1 are in contrast to their unpublished data that showed much smaller variability. It is difficult for us to interpret the difference between our studies without the details of their inclusion and exclusion criteria and characteristics of their study participants. However, our results are consistent with those reported previously by other research groups.2,3
Bunya VY, Pistilli M, Massaro-Giordano M. Accuracy of Laboratory Assays in Ophthalmic Practice—Reply. JAMA Ophthalmol. 2015;133(12):1480–1481. doi:10.1001/jamaophthalmol.2015.3858
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