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 ...

That’s why we reward it at SNHU. As a community college member of the Phi Theta Kappa (PTK) Honor Society, you've already been recognized for your academic success. And at Southern New Hampshire ...

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 ...