The surgeon creates a flap of tissue across the cornea with an instrument called a microkeratome, ablates the cornea for about 30 seconds, and then replaces the flap.
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The instrument for measuring the angles of a triangle is called a protractor.
The instrument used to measure a angle is called a protractor!
taking readings using theodolite keeping the vertical circle of the instrument on left side of the observer is called a face left observation and to measure horizontal angle the instrument is rotated(swing) in horizontal plane with respect to the vertical axis in a clockwise direction called rigt swing.
If a few of the axillary lymph nodes closest to the breast also are taken out, the surgery may be called an extended simple mastectomy.
That describes the musical instrument known as the "Triangle".