[M-T] EN>DE follow-up (masked) investigator in a clinical trial

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Hi everybody,

Does anyone know what a " follow-up (masked) investigator " is in a clinical

trial (translation of a CRF)? I neither know what a " follow-up investigator "

is nor what " masked " means (maybe the same as " blinded " ?)

Strangely, the " follow-up investigator " has to perform an eye examination

even at screening and baseline visits.

Any idea for an explanation or even translation into German?

Thanks.

Charlotte Kauczor