Improving astronaut vision in long-haul space flights
. This is valid only when a subject’s CSF pressure is close to or greater than the intraocular pressure .
In this study, we used our modified PPG technology to measure normal participants in two different postures. Due to a paucity of data in the low IOP range, the broken stick methodology was inappropriate as subjects were likely to have normal intracranial pressure . Therefore, we compared pulsation amplitudes from all data points within the central half of the optic disc centre.From 14 eyes of 7 participants, video sequences were recorded. In one eye of one subject there was inadequate video quality for analysis. So, 4801 vein pulsation amplitude data points from 13 eyes were analysed. Subjects had mean age of 42 years, four of whom were male. The mean baseline IOP was 14.0 mmHg .
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