Posture Changes and Subfoveal Choroidal Blood Flow

Abstract

Based on previously reported experimental data that indicate that the ocular perfusion pressure increases less than predicted by purely hydrostatic considerations when the body is tilted from the standing to the supine position, the observed increase in ChBF suggests a passive response of the choroidal circulation to the posture change.

Effects of photodynamic therapy on subfoveal blood flow in neovascular age-related macular degeneration patients

“…The LDF technique was used in this study because of its noninvasiveness, the short-lasting measurements, which facilitate recordings in elderly patients, and the reported reproducibility and sensitivity in healthy [12][13][14] and AMD eyes. [15][16][17][18][19][20] Great care was taken to keep the DC as constant as possible during the recordings, which is necessary for valuable comparisons of ChBF parameters in a given patient.…”

“…12 The sensitivity of the LDF measurements in AMD eyes of this study was consistent with that described in healthy eyes using the same device. 7,13,14 The calculation of the sensitivity is bound to an experience and not to the instrument. It gives the minimum variation of a parameter that is statistically significant in response to a given stimulus (PDT in this experiment) for a given population of patients.…”

The Effect of Dynamic and Isometric Exercise on Refractive State, Accommodation and Intra-Ocular Pressure

“…As noted earlier, increased IOP has also been associated with axial growth, with scleral creep possibly resulting from an inability to resist these intra-ocular forces. As an alternative hypothesis, sustained accommodation may lead to increased IOP and ultimately axial elongation [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. It is also of interest that improved physical fitness is associated with lower baseline IOP as well as decreased exercise-induced reduction in IOP [11].…”

The effect of physical effort on retinal activity in the human eye: rod and cone flicker electroretinogram studies

“…The retina is highly metabolically active, resulting in a high rate of oxygen consumption [1]; therefore, the retinal cells are particularly susceptible to changes in blood flow [2,3] and hypoxia conditions [4,5]. Physical effort induces both increased blood flow and hypoxic states.…”