OPTICS OF THE SURGICAL MICROSCOPE
l Present day microscopes are stereo microscopes with Galilean optics
l Galilean optics focus at infinity and send parallel beams of light to each eye and are also referred as infinity corrected optics
l It permits relaxed viewing with minimum eye strain and fatigue
Allows the clinician to see the depth of field
Optical principles
l At the front , the objective lens with a large diameter images the objects towards infinity
l Right behind the lens ,the magnification changer systems increases or decreases the initial magnification of the front lens system
l Behind it the binocular tube and the eyepiece form a telescope .Binocular tube serves for further magnification and inversion of the image
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