Phototherapeutic keratectomy (PTK) ablates the corneal stroma, improves corneal clarity, smooths the surface and is less invasive than other surgeries, such as grafting, she said. PTK can be used ...

The study also indicated that the PRK and PTK combination significantly improves visual acuity. Gerald W. Zaidman, MD, and colleagues at New York Medical College in Valhalla, N.Y., reviewed their ...