By
Elodie Vaz | Published on March 13, 2026 | 3 min read
Glaucoma is
one of the leading causes of irreversible blindness worldwide. This condition
encompasses a group of optic nerve disorders often associated with increased
intraocular pressure. This pressure usually results from an imbalance between
the production and drainage of aqueous humor, the fluid circulating inside the
eye.
Currently,
management primarily relies on lowering this ocular pressure using eye drops,
laser therapy, or surgery. However, these approaches do not always prevent
disease progression. As Katy Liu, ophthalmologist at Duke University School of
Medicine, stated in a press release: “The only way to treat glaucoma is to reduce eye pressure, and yet we still
have patients who go blind despite current treatments.”
New
research published on March 9 in the journal Immunity provides new
insight into the biological mechanisms involved in regulating this pressure,
highlighting the unexpected role of specialized immune cells.
The
immune system at the core of ocular pressure regulation
The study
aimed to determine whether specific populations of immune cells contribute to
maintaining the eye’s hydrodynamic balance. Researchers focused on resident
macrophages, immune cells permanently present in tissues and known for
eliminating cellular debris and pathogens.
Until now,
their function in ocular drainage structures had remained unknown. “This research helps us understand the role of the immune system in regulating
ocular pressure,” explains Katy Liu.
The
hidden role of macrophages
To explore
this potential role, researchers used a mouse model in which resident
macrophages were labeled with fluorescence. This approach allowed them to
precisely track the cells’ location and activity in tissues involved in aqueous
humor drainage.
The team
then selectively eliminated these cells in order to observe the physiological
consequences on intraocular fluid circulation and ocular pressure.
A new
therapeutic target for glaucoma
The
observations revealed that resident macrophages play a crucial role in
maintaining the permeability of the eye’s drainage structures. When these cells
were removed, researchers observed blockage of the outflow channel, leading to
fluid accumulation and increased intraocular pressure.
“Our
results show that resident macrophages are essential for maintaining healthy
eye pressure,” says Katy Liu. “Disruption of this system can directly
contribute to the development of glaucoma.”
These cells
appear to function as a true clean-up crew, removing elements that could
obstruct ocular drainage pathways. This function suggests a direct link between
tissue immunity and ocular homeostasis.
According
to Dr. W. Daniel Stamer, co-senior author of the study: “We now have a precise target for developing new therapies capable of
normalizing eye pressure and halting vision loss, unlike current drugs that do
not target the source of the disease.”
This work
provides new insight into the role of the immune system in the pathophysiology
of glaucoma and identifies resident macrophages as key regulators of
intraocular pressure.
For Daniel
Saban, co-senior author, “this discovery represents a major advance in
understanding the role of the immune system in regulating ocular pressure.” He
also emphasizes that these findings are part of a translational research
approach aimed at converting fundamental discoveries into clinical
applications.
The next
step will be to confirm the presence and function of these macrophages in human
ocular tissues. If validated, these findings could open the door to new
therapeutic strategies targeting the cellular mechanisms responsible for
pressure imbalance, rather than only its consequences. Such an approach could
ultimately transform glaucoma management and reduce the risk of blindness
associated with this disease.
Read next: Laser and glaucoma: a high-pressure
duel
About the Author – Elodie Vaz
Health journalist, CFPJ graduate (2023).
Élodie explores the marks diseases leave on bodies and, more broadly, on
human life. A registered nurse since 2010, she spent twelve years at patients’
bedsides before exchanging her stethoscope for a notebook. She now investigates
the links between environment and health, convinced that the vitality of life
cannot be reduced to that of human.
