Keratotomy, radial Surgery: Procedure, Risks, Recovery

Introduction

Radial keratotomy (RK) is a refractive surgery procedure developed in the 1970s to correct myopia (nearsightedness). The procedure involves making radial incisions in the cornea to flatten its central optical zone, thereby reducing or eliminating the need for corrective lenses. RK was pioneered by Russian ophthalmologist Dr. Svyatoslav Fyodorov and gained popularity in the 1980s and 1990s before the advent of more advanced refractive surgery techniques like LASIK.

Procedure

Radial keratotomy is performed under local anesthesia and typically takes about 30 minutes per eye. The surgeon carefully marks the cornea and uses a diamond blade to make a series of radial incisions, usually 4 to 8, extending from the edge of the cornea towards the center. The depth and length of the incisions are precisely calculated based on the patient’s degree of myopia. These incisions cause the central cornea to flatten, reducing its refractive power and improving vision.

Risks and Complications

While radial keratotomy is generally safe, it does carry certain risks and potential complications. These include:

• Over- or under-correction of myopia
• Fluctuating vision, especially in the first few months after surgery
• Glare, halos, or starbursts around lights
• Infection or slow healing of the incisions
• Rarely, progressive corneal ectasia (weakening and bulging of the cornea)

Patients with certain conditions, such as thin corneas or autoimmune disorders, may not be good candidates for RK due to a higher risk of complications.

Recovery and Postoperative Care

After radial keratotomy, patients typically experience some discomfort, light sensitivity, and blurred vision for a few days. Most people can return to normal activities within a week, although complete visual stabilization may take several weeks to months. During the recovery period, patients are prescribed antibiotic and steroid eye drops to prevent infection and promote healing. Regular follow-up visits with the eye surgeon are essential to monitor the healing process and address any complications.

Outcomes and Effectiveness

Radial keratotomy has been shown to be effective in reducing mild to moderate myopia, with many patients achieving 20/40 vision or better without glasses or contact lenses. However, the long-term stability of the results can vary, and some patients may experience a gradual shift towards farsightedness (hyperopia) over time. Additionally, RK does not correct astigmatism and may even induce it in some cases. The Prospective Evaluation of Radial Keratotomy (PERK) study found that while most patients were satisfied with their outcomes, there was a significant rate of complications and a need for enhancement procedures in some cases.

Alternatives to Radial Keratotomy

With the development of newer refractive surgery techniques, such as photorefractive kerat ectomy (PRK) and laser-assisted in situ keratomileusis (LASIK), radial keratotomy has largely fallen out of favor. These newer procedures use excimer lasers to precisely reshape the cornea, offering more predictable and stable results with fewer complications. Additionally, advances in intraocular lens technology have made phakic IOLs and refractive lens exchange viable options for some patients seeking vision correction.

Conclusion

Radial keratotomy played a significant role in the evolution of refractive surgery, offering a solution for millions of people with myopia. While it has largely been replaced by more advanced techniques, understanding the history, principles, and outcomes of RK remains essential for eye care professionals and patients seeking to make informed decisions about vision correction options.