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Diagnosing Dry Eye

Rice University bioengineering students responded to an ophthalmologist's cry for help with a device to diagnose dry eye, the itching and burning sensation that results when a person doesn't produce enough tears or the tears evaporate too quickly.

A team of five seniors made a portable unit that controls the air around a patient's eyes so doctors can study and treat those who suffer from this painful condition.

Stephen Pflugfelder of Baylor College of Medicine's Cullen Eye Institute, approached Rice to invent a device to help clinicians standardize a testing regime for dry eye.

"He wanted a way to control temperature, humidity and air flow all around the eyes and record it over time so he could track changes in their dryness," said Daniel Hays, a member of Team ClimaTears, the student group that included Austin Edwards, Amanda Shih, Anastasia Alex and Michelle Kerkstra.

The students' solution incorporates a modified and padded set of laboratory goggles with embedded data sensors that monitor temperature, relative humidity, air flow and blink rate over an hour and a half. A cable carries data saved every 10 seconds to a small box that includes controls and conditioning equipment. A separate hose carries air to the goggles.

The goggles keep the humidity of air around the eyes between 40 and 15 percent. 

"We're exacerbating the symptoms so doctors can see them," Hays explained.

Normal patients will produce tears, he said, but those who suffer dry eye will exhibit symptoms, which will give clues about how to treat them. Follow-up sessions with the goggles will let doctors see how well the treatment is working.

"We did a lot of research on the ocular test they currently perform to help us analyze the data we collected," Alex said. "We know there's still a lot to be done."

The team and Pflugfelder spent two weeks this spring testing patients at the Alkek Eye Center in Houston and will continue this summer. The students hope the larger trial will lead to an academic paper — a fine reward for spending nearly 2,000 hours developing the goggles over the course of their final year at Rice.
Their work has already paid dividends. The students won the grand prize, $1,500, in the second annual Rice Alliance-George R. Brown School of Engineering Senior Design Elevator Pitch Competition last November and, more recently, $500 for the Best Health-Related Engineering Design Project at the School of Engineering Design Showcase held April 14.

The team's faculty advisers were Renata Ramos, a Rice lecturer in bioengineering, and Maria Oden, professor in the practice of engineering education and director of Rice's Oshman Engineering Design Kitchen, where the goggles were developed.

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