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We appreciate the thoughtful comment on our paper ‘Cerebrospinal fluid exchange in the optic nerve in normal-tension glaucoma’1 and we definitely agree, as mentioned in our paper, that a control group of normals would be desirable in the evaluation of this problem. However, as cisternography is invasive, we could not set up a gender-matched group of normals, but were at least able to …
Competing interests None.
Provenance and peer review Not commissioned; externally peer reviewed.