Ocular Volume Change per Cardiac Cycle

Abstract

Ocular pneumoplethysmograph (OPG) tests were performed in 499 employees of an industrial firm. The ocular volume change (OVC), in microliters per cardiac cycle, was calculated from each of OPG tests. In the 195 females, the OVC was 294 ± 81 µl. In the 304 males, the OVC was 269 ± 86 µl. The female-male OVC difference was significant, p = 0.001.

Gender and Age Effects on Pulsatile Ocular Blood Flow

“…However, we note a significant difference between the magnitude of the POBF values reported by Gee et al [20] [24]). These OBF values can be expressed per 1.9 g of vascularized ocular tissue [22] and compared with 'universally accepted figures of 50-55 ml/100 g/min for the brain' [22].…”

“…Male-female differences in POBF have recently been reported by Gee et al [20] using the method of ocular pneumoplethysmography (OPG-G), but without finding significant differences among three age decades for males or females. However, we note a significant difference between the magnitude of the POBF values reported by Gee et al [20] [24]).…”

“…Then the blood flow to the eye has a ratio to the blood flow to the brain of 0.8-0.9 (this work), 0.6-0.8 (previous OBF Tonograph [16,17]), 1.1 (microspheres [21]), 1.3-1.5 (OPG-G [22][23][24]) and 19.3-23.5 (OPG-G [20]). A new mathematical formulation has been used for the recent OPG-G POBF calculations by Gee et al [20], without a reconciliation with the former OPG-G [22][23][24] values.…”