Purpose: To clarify the discrepancy found in literature about a possible learning effect in frequency doubling perimetry (FDT) by measuring the learning effect in a large group of subjects of various ages, with and without perimetric experience, and with and without glaucoma Methods: Two FDT measurements were performed in three groups: young normals without perimeric experience (group I, n =26), aged normals without perimetric ex-
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