Office of NIH History  
The Ultimate Portrait Painter: Howard Bartner and Forty Years of Medical Illustration
  Painting 1 : Glaucomatous Optic Disc  
  Painting of a normal optic disc and a glaucomatous optic disc  
  In the normal optic disc on the left, the number of optic nerve fibers is normal. The cup within the optic nerve is small and the vessels are near the center of the disc. In the glaucomatous optic disc on the right, increased pressure within the eye has caused the disappearance of a large number of optic nerve fibers. Therefore, the cup has enlarged and the disc vessels have curved along the cup's contour.  
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