Topic: Health

Scientists have developed a new technique called electromechanical reshaping (EMR) that can correct vision problems without using lasers or surgery. This method temporarily softens the cornea so it can be gently molded into a new shape.

Millions of people in the United States live with blurry vision, nearsightedness, or more severe sight problems. While glasses and contact lenses help many people, millions have turned to corrective procedures like LASIK to sharpen their eyesight. However, scientists are now exploring a different approach that could someday reshape the eye without lasers, cutting, or invasive surgery.

Researchers from Occidental College and the University of California, Irvine have been developing an experimental technique called electromechanical reshaping (EMR). Instead of carving away tissue like LASIK, the method temporarily softens the cornea so it can be gently molded into a new shape. Early tests in rabbit eyes suggest that the technology may one day provide a cheaper, less invasive alternative to traditional laser eye surgery.

The cornea is the clear, dome-shaped surface at the front of the eye. It bends incoming light and helps focus images onto the retina. When the cornea is too steep, too flat, or unevenly shaped, vision becomes blurry. LASIK corrects those problems by using lasers to remove tiny amounts of corneal tissue and permanently reshape the eye.

Michael Hill, a chemistry professor at Occidental College, says that the basic concept behind LASIK still comes down to tissue removal. "LASIK is just a fancy way of doing traditional surgery. It's still carving tissue -- it's just carving with a laser." That limitation inspired researchers to search for a way to reshape the cornea without making incisions at all.

The idea behind EMR emerged unexpectedly during earlier experiments involving cartilage and other collagen-rich tissues. "The whole effect was discovered by accident," explains Brian Wong, a professor and surgeon at the University of California, Irvine. "I was looking at living tissues as moldable materials and discovered this whole process of chemical modification." Collagen-rich tissues throughout the body, including the cornea, maintain their shape through networks of charged molecules that hold the structure together.

Because these tissues contain large amounts of water, scientists found that applying a mild electric current can temporarily alter the tissue's acidity level, or pH. As the pH shifts, the molecular bonds holding the tissue rigid begin to loosen. This briefly makes the tissue flexible enough to reshape. Once the pH returns to normal, the tissue stiffens again and locks into its new form.

Researchers had previously tested EMR on rabbit ear cartilage, pig skin, and scar tissue. The cornea became one of the most promising targets because even small changes in its curvature can dramatically improve vision.

To test the technique, the team created specialized platinum "contact lenses" shaped to match the desired curvature of the cornea. Rabbit eyeballs were placed in a saline solution designed to mimic natural tears, and the platinum lens served as an electrode. When researchers applied a small electrical potential, the cornea gradually softened and conformed to the shape of the lens.

The entire process took roughly one minute, which is similar to the time required for LASIK itself, but without cutting tissue or using expensive laser systems. The team tested the procedure on 12 rabbit eyeballs. Ten were treated to simulate correction for myopia, also known as nearsightedness. In those eyes, the corneas successfully achieved the intended focusing power that would correspond to improved vision.

Importantly, the cells within the tissue remained alive because the researchers carefully controlled the pH changes during treatment.

Why It Matters

This new technique could provide a cheaper and less invasive way to correct vision problems for people in India. It's an exciting development that could improve the lives of millions of Indians who rely on glasses or contact lenses for their daily needs.

Key Facts

• Scientists have developed a new technique called electromechanical reshaping (EMR) that can correct vision problems without using lasers or surgery.
• The method temporarily softens the cornea so it can be gently molded into a new shape.
• Early tests in rabbit eyes suggest that EMR may one day provide a cheaper, less invasive alternative to traditional laser eye surgery.
• The entire process took roughly one minute, which is similar to the time required for LASIK itself, but without cutting tissue or using expensive laser systems.
• The team tested the procedure on 12 rabbit eyeballs and found that it successfully corrected myopia in 10 of those eyes.

Key Terms

LASIK

A surgical procedure that uses lasers to correct vision problems by reshaping the cornea.

Implications

This new technique could provide a cheaper and less invasive way to correct vision problems for people in India. It's an exciting development that could improve the lives of millions of Indians who rely on glasses or contact lenses for their daily needs.