Custom lens replacement surgery is painless and one of the safest medical procedures out there. The patient will be given a local anesthetic before the procedure to ensure that they won't feel any pain. Patients commonly experience some brief discomfort as the anesthetic wears off. It is common for patients to experience mild discomfort or itching around the eye in the days after having artificial lenses implanted, but this usually goes away quickly. In most cases, over-the-counter analgesics are more than adequate to treat any discomfort the patient may be feeling.