PRK XTRA

PRK with Corneal Cross-Linking

This procedure is for patients with borderline corneal thickness where it might not be safe to perform Lasik or SMILE. In some cases where an enhancement is needed, CXL is performed in addition to PRK to strengthen the cornea.

Patients with thinner than average corneas, asymmetry on corneal topography, against-the-rule astigmatism, or steep corneas may especially benefit.

Following Photo Refractive Keratectomy (PRK), the cornea can be strengthened or tightened and the new corneal shape “locked in” used a technique called accelerated Corneal Cross-linking (CXL). Riboflavin (Vitamin B2) is applied to the cornea and allowed to hydrate the cornea. Ultraviolet light is then applied to the cornea for approximately 90 seconds, which causes strengthening and Cross-linking of the corneal collagen fibres through a biochemical reaction of the Riboflavin with Ultraviolet light. PRK XTRA reduces the chances of regression and is offered to all patients undergoing PRK whose corneas are thin, and those who have asymmetric astigmatism.

The Following Refractive Errors Can Be Corrected (Exceptions May Apply):
Myopia (Nearsightedness): Up to -8.00 Diopters
Hypermetropia (Farsightedness): Up to +3.00 diopters
Astigmatism: Greater up to 5.00 Diopters

PRK XTRA Photo

What is the recovery like?
The recovery is the same as for PRK. Since the epithelium is removed, a bandage contact lens is applied to the eye for 3-4 days. The patient is typically on antibiotic drops for 1 week, and mild steroid drops for about 1-3 months after surgery, depending on the cornea’s healing response. Patients will return for regular visits to monitor their healing 1 month, 3 months, 6 months and 1 year after surgery.

How well does it work?
Typically only one treatment is required. This depends on the amount of astigmatism, the initial refraction, and the patients’ healing response. 

How long does it last?
Over almost two decades of results have shown that collagen cross-linking appears to stabilize the cornea and that the strengthening effect increases over time, even after 2-3 years. Corneal Collagen Cross-linking with Riboflavin treatment can be repeated if necessary.

For therapeutic use, CXL can be used stabilize conditions such as Keratoconus, Forme Fruste Keratoconus (an extremely mild or subclinical form of Keratoconus), and post-laser refractive surgery ectasia. Studies have shown that for about 95% of Keratoconus patients the cross-linking procedure prevents further vision loss and corneal weakening.

Staying ahead of COVID-19

We are going above and beyond the standard infection prevention and control measures to protect you and to create the safest possible environment for you. Your safety is our priority, and you will never encounter overcrowded waiting rooms or treatment areas at our new surgical facility. We never compromise on quality or safety.