1.   Eye operations often involve the use of highly sophisticated equipment, such as lasers.

2.   This operation involved cutting the main fibre tract that joins the two halves of the brain, the corpus callosum.

3.   This particular operation involves lengthening the Achilles tendon.

4.   Where our Investigation Department operations involved shipping and small craft we were the specialists to whom they could turn for practical assistance.

5.   The operation involves making several cuts in the cornea.

6.   As the name implies, this operation involves emphasizing the boundary or edge features on the image so that it looks less blurred.

7.   An open-market operation involves people exchanging bonds and bills for money.

8.   Barak told reporters that the rescue operation had involved several dozen soldiers, who had to use explosives to get into the Bir Nabala hideout because access was blocked.

9.   But in most cases, the operations have involved smaller teams.

10.   In still more advanced cases, the operation may involve removal of muscles and other tissues.