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. 2011 Sep 13;52(10):7238–7247. doi: 10.1167/iovs.10-6464

Figure 3.

Figure 3.

Graphs showing ChBF (A) and choroidal resistance (B) (±SEM) graphed as a function of the corresponding ABP, over an ABP range of 35 to 140 mm Hg in 22 aged pigeons whose mean age was 10.9 years. The mean ChBF and ABP are graphed as a percentage of basal ChBF and ABP for the 50 <1-year-old pigeons. The red line in A shows ChBF as it would be if it linearly followed ABP, that is, with no compensation. As can be seen, ChBF in aged pigeons linearly followed ABP at >90 mm Hg, and was maintained at approximately 65% of basal ABP over the 50 to 90 mm Hg range. The red line in B shows choroidal resistance as it would be if it linearly followed ABP (i.e., with baroregulatory compensation). Graph B shows that choroidal resistance over the 50 to 90 mm Hg range was elevated, but nonetheless declined linearly with ABP. Note that choroidal vascular resistance in the aged birds was unusually high at 90 to 110 mm Hg, but insufficient for choroidal baroregulation above 110 mm Hg.