Orthokeratology

Orthokeratology (also known as ortho-k, corneal reshaping (CR), corneal refractive therapy (CRT), overnight vision correction, corneal molding (CM), and vision shaping treatment (VST)) is a method used to correct myopia (nearsightedness) and mild degrees of astigmatism.

Overview

Orthokeratology involves the fitting of a series of rigid gas permeable contact lenses that the patient wears for limited periods, such as overnight. These lenses are designed to reshape the cornea, the clear front surface of the eye, to temporarily reduce or eliminate myopia or astigmatism. The lenses are removed during the day, allowing the cornea to retain its new shape and the patient to see clearly without the need for glasses or contact lenses.

Procedure

The orthokeratology procedure begins with a comprehensive eye examination and measurement of the corneal curvature using a device called a corneal topographer. This device creates a detailed map of the cornea's surface, which is used to design the ortho-k lenses.

The lenses are typically worn overnight and removed in the morning. The exact wearing schedule will depend on the patient's individual needs and the amount of correction required.

Benefits and Risks

Orthokeratology can provide a temporary solution for myopia and astigmatism without the need for glasses or daytime contact lenses. It can be an effective option for people who are not suitable candidates for laser eye surgery due to age or other factors.

However, orthokeratology carries risks, including the potential for eye infection and corneal abrasion. It is important for patients to follow their eye care professional's instructions for lens care and handling to minimize these risks.

See Also

• Contact lens
• Cornea
• Myopia
• Astigmatism
• Laser eye surgery