Foldable (soft) lens has a diameter of 6.0 mm and is made of either Silicon or Soft Acrylic. It can be injected through a needle into the eye through the 2.2 mm opening made for the surgery. The lens unfolds automatically to take its position. Non-foldable (hard) lens has a diameter of 5.5 mm. A 2.2 mm incision has to be enlarged to 5.5 mm to introduce this lens. However the incision still remains self-sealing and requires no sutures, but it may induce some curvature changes in the eye.