Researchers design a gravity-free wearable patch for applying eyedrops

By the Everything Space news desk · 20 Oct 2026 · written from the sources below

Image: Phys.org

The device could let astronauts self-administer eye medication in microgravity and may also help people with tremors on Earth.

A team of researchers has built a flexible wearable patch that can deliver eyedrops without relying on gravity, aiming to solve a practical problem for astronauts on long space missions. Standard eyedrop bottles depend on gravity to let drops fall into the eye, a method that does not work properly in microgravity environments.

The patch uses a chemical reaction instead of gravity to push the liquid medication into place. Inside the device, vitamin C and baking soda react when they come into contact with water, producing carbon dioxide gas. That gas builds pressure, which forces the eyedrop through a microchannel and toward the eye when the wearer presses an activation area on the patch.

A filter inside the patch separates the gas-producing chemicals from the eyedrop itself, letting gas through while blocking liquid, so the two stay isolated until the dose is delivered. Because the system runs on this internal pressure rather than an external pump or power source, the researchers suggest it could work well in settings where equipment and support are limited, such as spacecraft.

In testing, the patch released eyedrops reliably regardless of which direction gravity was pointing, and when worn by human participants on Earth, it delivered medication at levels comparable to conventional eyedrop bottles. The researchers note that these tests were conducted on Earth under varied gravity orientations, so the device still needs to be verified in an actual space environment before it could be used by astronauts.

Beyond space applications, the team points to potential uses on Earth, particularly for people who struggle to aim traditional eyedrop bottles due to hand tremors or conditions such as Parkinson's disease. The lead researcher described the patch as a wearable platform capable of delivering medication without extra equipment, with potential uses extending into space medicine and other fields.

Written in Everything Space’s own words by our news-desk model from the sources above, and checked against them in code: every number in this report appears in its sources, and no sentence is copied from them.