The surgical microscope is often used to provide illumination and magnification for complex procedures to the ear,laryngeal surgery,or reconstructive free flap procedures following neck surgery.A common eyepiece magnification for an otologic microscope is ´12.5,and the usual objective (lens)is ______-mm focal length (f).A _______-mm lens is used for laryngeal surgery.

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A common eyepiece magnification for an otologic microscope is ´12.5,and the usual objective (lens)is 250- or 300-mm f.A 400-mm lens is used for laryngeal surgery.The total magnification is determined by multiplying the magnification of the eyepiece by that of the microscope body times that of the objective.The type of head and objective selected is based on the surgeon's preference.Microscopes equipped with a variable distance feature allow the surgeon to adjust the focal length from 200 to 400 mm without changing the lens objective.

The Surgical Microscope Is Often Used to Provide Illumination and Magnification