Getting into focus years after Lasik

Some patients find that, with age, reading becomes a problem

a fix is coming


The big promise of Lasik vision-correction surgery - that you could throw away your glasses and contacts - was only a half-truth, as maturing Lasik patients are beginning to realize.

Lasik has become hugely popular over the past decade, especially among young adults. But by middle age, virtually everyone develops presbyopia, the inability to read or focus close-up. So even former Lasik patients are rummaging through drugstore racks for a pair of reading glasses that won't make them look like grandparents.

Soon, however, there may be a way for them to remain free of glasses. A company called Refractec Inc. is studying whether conductive keratoplasty, a radio-wave treatment for presbyopia, can be used on people who have had Lasik.

The idea is to pair the two treatments so people never have to wear contacts or glasses again.

A preliminary study presented recently at the annual meeting of the American Academy of Ophthalmology in Chicago showed no safety problems and satisfactory outcomes for near and far vision.

"There were no patients who were dissatisfied. There was a significant improvement in near vision, and their distance vision was unaffected," said Dr. Daniel S. Durrie, lead investigator of the study and an ophthalmologist in Kansas City, Kan.

"Patients are very interested in this. These are highly successful Lasik patients who say they'd really like to have a procedure [for presbyopia] that doesn't cut or remove anything. And conductive keratoplasty is a very simple procedure."

Eye doctors are eager to find options for aging Lasik patients. More than 4 million Americans have had Lasik; according to Refractec, the average Lasik patient is 39.

Lasik, which can be used for vision problems such as nearsightedness, farsightedness and astigmatism, uses a laser to reshape the cornea.

"People who had Lasik in their 30s, they got free of glasses and had this epiphany," said Dr. Robert K. Maloney, a Los Angeles ophthalmologist who performs Lasik as well as conductive keratoplasty. "All of a sudden, they are 45 and need reading glasses. These patients have spent five or 10 years without glasses. It's depressive for that group."

Conductive keratoplasty is a much different kind of treatment from Lasik. It is performed using a probe - with a tip thinner than a strand of hair - that releases radio-frequency energy.

The radio waves are applied to the cornea in a circular pattern to gently shrink small areas of collagen; this creates a constrictive band that increases the curvature of the cornea, bringing near vision back into focus.

NearVision CK, Refractec's proprietary name for the procedure, was approved in 2002 for hyperopia, a condition that can occur in people of any age in which near vision isn't clear. Last year, it was approved for the treatment of people whose only vision problem is age-related presbyopia.

The procedure has become the fastest-growing vision correction treatment since the introduction of Lasik in the mid-1990s.

In the study of 23 post-Lasik patients, Durrie found that 22 of them were able to read phonebook-size print after conductive keratoplasty while maintaining good distance vision. There were no safety problems. The study eventually will encompass 150 patients.

If those patients show similar results, Refractec plans to seek approval from the Food and Drug Administration to market conductive keratoplasty for the treatment of presbyopia in post-Lasik patients.

"Most of us have been doing CK on post-Lasik patients for several years already. At present, it's a legal and off-label use of the device," said Dr. Marguerite McDonald, a clinical professor of ophthalmology at Tulane University School of Medicine in New Orleans.

She served as an investigator of Lasik and was involved in earlier clinical trials for CK.

"This study is designed to give doctors and patients more information about post-Lasik CK, and will allow the company to market for this indication."

This combination of vision correction procedures won't be for everyone, however. It works by producing monovision, meaning that one eye would be left as corrected by Lasik for distance, and the other would be corrected with CK to bring print and near objects into focus.

But this means the eyes can't work together, and some people can't adapt to having one eye blurred at all times. Depth perception can also be a problem with monovision.

But, McDonald said, monovision from conductive keratoplasty tends to be more satisfactory than that produced by wearing a single contact lens. Conductive keratoplasty interferes less with distance vision.

"A lot of people who `flunked' monovision with contacts do well with CK," she said.

Though conductive keratoplasty is fast and is considered safe, another potential drawback is that it must be repeated periodically.

The aging eye's lens continues to lose flexibility, so patients will need repeat procedures every one to four years at a cost of about $1,200 to $1,800 each time.

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