Study finds, Vertical position of the central retinal vessel
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A Study was conducted to investigate the association between the vertical position of the central retinal vessel (CRV) within the optic nerve head (ONH) and site of visual field defects (VFDs) in glaucoma.

In 134 glaucoma eyes and 61 normal eyes, spectral-domain optical coherence tomography was performed to establish the vertical location of the CRV at the point where it exits the lamina cribrosa (LC) onto the ONH surface (exit position). It was also discovered near the pre-glaucoma location at the entrance point into the LC from the retro-laminar ONH region (entry position), which was unaffected by glaucomatous LC deformation. They were compared in glaucoma and healthy eyes, as well as in glaucoma and healthy eyes with various VFD sites.

Results:
--In glaucoma eyes, the entry position of the CRV was in the superior ONH region in 63.0% of eyes with superior VFDs and in the inferior ONH region in 97.8% of eyes with inferior VFDs.

--The exit position exhibited similar percentage. The vertical CRV position was not significantly different between glaucoma and normal eyes both at the entry and exit positions.

Finally, eyes having CRVs in the superior ONH region had a higher likelihood of forming VFDs in the superior hemifields, and vice versa. The development of glaucoma had no effect on the CRV's vertical position. The location of the CRV prior to the onset of glaucoma may have an impact on regional susceptibility to glaucomatous stress and may be beneficial in predicting the first site of VFDs.

Source: https://www.sciencedirect.com/science/article/abs/pii/S0002939421003044?dgcid=rss_sd_all
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