New technology advances understanding of eye pressure and glaucoma

Millions of people at risk of glaucoma understand the importance of healthy eye pressure in preserving vision. However, scientists have struggled to fully comprehend what regulates daily eye pressure fluctuations and how they may contribute to glaucoma. A team led by USF professor Christopher Passaglia has developed a wireless eye-pressure monitoring system that collects continuous measurements in rats, which exhibit daily eye-pressure rhythms similar to those in humans.

The research, published in Investigative Ophthalmology & Visual Science, sheds new light on the role of the body's circadian rhythm in regulating eye pressure.

Passaglia's monitoring device, consisting of a miniature pressure sensor connected to the rat's eye, captured pressure changes throughout the day and night, revealing a daily rhythm in eye pressure. This nightly rise in pressure, if sustained continuously, is associated with glaucoma. The researchers discovered that this increase is driven by neural signals traveling from the brain to the eye, suggesting that eye pressure is connected to the body's internal clock rather than being regulated solely within the eye.

To investigate the impact of the circadian rhythm on eye pressure, researchers disrupted the animals' normal light-dark cycle by exposing them to constant light. Surprisingly, this disrupted the rhythmic pattern and caused mean pressure to increase, indicating that light plays a more significant role in regulating eye pressure than previously understood.

While these findings were conducted in rats and do not imply that artificial light exposure causes glaucoma in humans, they provide valuable insights into the connection between the eye and the body's internal clock, raising new questions about how disrupted light cycles may affect long-term eye health.