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We would like to thank Dr Rao and colleagues for their interest and comments regarding our study.1 In their letter, they pointed out two major issues concerning studies on long-term perimetric fluctuation: the definition of stability of the disease and the methods used to calculate fluctuation.
Dr Rao and colleagues claimed that the use of morphological data would have been desirable to define progression, as commonly done in studies on progression when both morphological and functional data are available (ie, progression is defined by means of morphological criteria in order to analyse the performance of functional parameters and vice versa).
Competing interests None.
Provenance and peer review Not commissioned; internally peer reviewed.