# Postmortem Analysis of Optic Nerve Head Vascularization in an Individual With Glaucoma

## TL;DR

This study explores whether people with glaucoma have fewer blood vessels in their optic nerve head, suggesting a possible link between sparse blood supply and glaucoma development.

## Contribution

The paper introduces a method for quantifying blood vessels in human optic nerve heads and reports findings from a rare glaucomatous case.

## Key findings

- Only two studies in the past 50 years have measured blood vessel density in glaucomatous optic nerve heads.
- Both prior studies and the current analysis found reduced blood vessel density in glaucomatous ONHs.
- A glaucomatous individual had fewer blood vessels in the superolateral quadrant compared to other quadrants.

## Abstract

Reduced ocular perfusion likely contributes to glaucomatous damage at the optic nerve head (ONH). In recent decades, investigators have focused heavily on ocular perfusion pressure and other factors affecting blood flow to the eye. Comparatively, far less attention has been focused on the blood vessels themselves. Here, we asked whether glaucomatous individuals exhibit anatomical deficiencies (i.e., fewer blood vessels) in their ONH blood supply. To answer this question, we performed a systematic literature review to (1) determine how many studies have reported measuring blood vessels in the ONH and (2) whether these studies reported differences in blood vessel quantity. Additionally, we report a method for quantifying blood vessels in ex vivo human ONH preparations, including an ONH from an individual with glaucoma. Our results show that only two studies in the past 50 years have published data concerning blood vessel density in glaucomatous ONHs. Interestingly, both studies reported decreased blood vessel density in glaucoma. Consistent with this finding, we also report reduced blood vessel numbers in the superolateral quadrant of a glaucomatous individual’s ONH. Vascularity in the three remaining quadrants was similar to control. Together, our findings raise the interesting possibility that individuals with a relatively sparse ONH blood supply are more likely to develop glaucoma. Future studies with larger sample sizes and more thorough quantification are necessary to determine the link more accurately between glaucoma and the blood supply to the ONH.