PTK removes superficial irregular tissue in the cornea working with an excimer laser. It is commonly used for corneal scars, surface area irregularities or recurrent erosions. The doctor places eye drops with your eyes to numb them. Then a lid speculum is positioned inside the eyes to carry them open. https://myfirstbookmark.com/story20885541/top-latest-five-best-lasik-eye-surgery-urban-news