Hydrogen Eye Drops Protect Retina from Damage in Animal Study
Protection of the retina by rapid diffusion of hydrogen: administration of hydrogen-loaded eye drops in retinal ischemia-reperfusion injury
Research hubs: Eyes & Vision System · Brain & Nervous System
This research was done in animals. Results in animals often don't carry over to people.
- Evidence type
- Animal study (rat)
- Authors
- Hideaki Oharazawa, Tsutomu Igarashi, Takashi Yokota, Hiroaki Fujii, Hisaharu Suzuki, Mitsuru Machide, Hiroshi Takahashi, Shigeo Ohta, Ikuroh Ohsawa
- Journal
- Investigative Opthalmology & Visual Science
- Year
- 2010
- PMID
- 19834032
- Study Type
- Rat
- Delivery
- Saline (Dissolved)
- Dose
- H2-loaded eye drops administered continuously during ischemia and/or reperfusion periods
- H₂ concentration
- saturated level
- Duration
- 1 weeks
- Outcome
- Positive
- Peer Reviewed
- Yes
- Cited by
- 170 (OpenAlex, as of November 2026)
- Country
- Japan
TL;DR
Hydrogen-infused eye drops can protect the retina from damage caused by temporary increases in eye pressure by reducing harmful oxidative stress.
Key Finding
Hydrogen-loaded eye drops reduced harmful free radicals in the retina and prevented cell death, with treated eyes recovering over 70% of normal retinal thickness after ischemia-reperfusion injury in rats.
Summary
Researchers tested whether hydrogen-enriched eye drops could protect rat retinas from damage caused by temporarily cutting off blood flow and then restoring it. When they applied these drops during and after the blood flow interruption, the hydrogen quickly reached the eye's interior, reduced harmful molecules called free radicals, and prevented the death of retinal cells. The treated eyes recovered more than 70% of their normal thickness, compared to untreated eyes.
Practical Takeaway
This rat study suggests hydrogen eye drops may have protective potential for retinal damage from blood flow interruption, but human testing is needed before any clinical use. The rapid penetration of hydrogen into the eye and lack of known toxicity are encouraging early signals, though the findings cannot yet be applied to human eye health.
Abstract (excerpt)
Purpose: Retinal ischemia-reperfusion (I/R) injury by transient elevation of intraocular pressure (IOP) is known to induce neuronal damage through the generation of reactive oxygen species. Study results have indicated that molecular hydrogen (H(2)) is an efficient antioxidant gas that selectively…