Researchers from Occidental College and the University of California, Irvine, have pioneered an innovative technique known as electromechanical reshaping (EMR). This groundbreaking method reshapes the cornea without the need for lasers or surgical incisions by temporarily softening the cornea, allowing it to be molded into a new configuration.
Initial studies conducted on rabbit eyes indicate that EMR could emerge as a more affordable and less invasive alternative to conventional laser eye surgeries.
Understanding LASIK's Mechanism
The cornea, a transparent dome at the front of the eye, plays a crucial role in focusing light onto the retina. When its shape is distorted--being too steep, flat, or uneven--vision can become unclear. LASIK addresses these issues by removing corneal tissue with lasers, permanently altering the eye's shape. While LASIK is widely considered safe, it can lead to complications such as dry eyes and glare.
Michael Hill, a chemistry professor at Occidental College, critiques LASIK, noting that it fundamentally involves tissue removal, albeit through advanced laser techniques.
A Serendipitous Discovery
The concept of EMR was serendipitously discovered during experiments with collagen-rich tissues. Brian Wong, a professor and surgeon at UC Irvine, recounts how he stumbled upon the idea while exploring the moldability of living tissues through chemical modification.
This method leverages the natural properties of collagen-rich tissues, which maintain their shape through charged molecular networks. Researchers found that applying a mild electric current can temporarily alter the tissue's acidity, or pH, leading to a loosening of molecular bonds.
As the pH level changes, the tissue becomes flexible enough to reshape. Once the pH normalizes, the cornea reverts to a more rigid structure, solidifying its new form.
EMR has shown promise in previous tests on rabbit ear cartilage and pig skin, with the cornea emerging as a particularly viable target for vision correction.
Reshaping Vision with Electricity
To evaluate the technique, researchers designed specialized platinum "contact lenses" that matched the desired curvature of the cornea. By placing rabbit eyeballs in a saline solution that mimics natural tears, the platinum lens acted as an electrode. When a small electrical current was applied, the cornea softened and conformed to the lens's shape, completing the process in about a minute--similar to LASIK but without tissue removal.
The treatment successfully corrected myopia in ten of the twelve treated rabbit eyes, enhancing their focusing power while keeping the cells alive through controlled pH changes.
Excitingly, the same technique also showed potential in reversing certain types of corneal cloudiness, which currently often necessitates a full transplant.
Why EMR Is Promising
Scientists believe EMR could mitigate many drawbacks associated with LASIK, preserving the eye's natural strength since it does not involve tissue removal. Imaging studies have indicated that the collagen structure in the cornea remains largely intact post-treatment.
As researchers refine this technology, advanced electrode contact lenses are being developed to monitor corneal shape and hydration during treatment. There is potential for EMR to address various vision issues beyond nearsightedness.
A Bright Future Ahead
While EMR remains experimental, researchers are optimistic about its future. The next steps involve extensive animal studies to assess the longevity and safety of reshaped corneas. If successful, EMR could revolutionize vision correction, offering a more accessible and reversible option without the need for lasers.
This research was supported by the National Eye Institute of the National Institutes of Health and the John Stauffer Charitable Trust.