Riva C E, Loebl M
Invest Ophthalmol Vis Sci. 1977 Jun;16(6):568-71.
The entoptic phenomenon by which one can observe leukocytes flowing in one's own parafoveal capillaries has been used to study the effect of changes in perfusion pressure on blood flow. Our measurements in humans with normal ocular fundi indicate that the retinal circulation of the parafovea is autoregulated in relation to perfusion pressure. The average time lag between a change in blood flow and the beginning of the autoregulatory response was about 46 sec., and the average duration of this response was about 48 sec. At the end of the autoregulatory response, the vascular resistance of the parafoveal segment was about 50% lower than that at normal intraocular pressure.
人们可以观察到白细胞在自己的黄斑旁毛细血管中流动的内视现象，已被用于研究灌注压变化对血流的影响。我们对眼底正常的人类进行的测量表明，黄斑旁的视网膜循环相对于灌注压是自动调节的。血流变化与自动调节反应开始之间的平均时间间隔约为46秒，该反应的平均持续时间约为48秒。在自动调节反应结束时，黄斑旁节段的血管阻力比正常眼压时低约50%。
