Repair of Irregularly Irregular Astigmatism by Transepithelial Phototherapeutic Keratectomy

In therapeutic refractive surgery, we currently have two excimer laser approaches for correcting corneal irregularities: custom ablation (topography-guided1 or wavefront-guided2) and transepithelial phototherapeutic keratectomy (PTK).3 During almost 20 years' experience with custom ablation, it has become apparent that custom ablation is an effective option for “global” irregularities (regularly irregular astigmatism) such as decentration and small optical zone, but performs poorly for “local” irregularities (irregularly irregular astigmatism).1 This has been shown to be due to the
Source: Journal of Refractive Surgery - Category: Opthalmology Authors: Source Type: research