Intracorneal ring segments (ICRS) allows safe and efficient treatment of keratoconus. The main advantage of ICRS for keratoconus is its reversibility. The cornea returns to preoperative levels ...

To construct the 16-kilometer section with TBMs, 76,940 segments will be cast to form 7,441 rings. Special ring segments are being cast for the tunnel lining, each ring comprising nine curved ...