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Purpose To explore changes in peripapillary retinal nerve fiber layer thickness(RNFLT)after acute intraocular pressure(IOP)elevation provoked by dark room prone provocation test(DRPPT).Methods Study Individuals underwent a 2-hour DRPPT,the peripapillary RNFL was imaged by spectraldomain optical coherence tomography(SD-OCT)before and immediately after the test.