DIFFERENTIAL DIAGNOSIS OF
FAMILIAL STRABISMUS AND TUMOR OF THE OCULOMOTOR NERVE ( III )

 
  INSTRUCTIONS:     Click and drag the pencil to observe tremor:
The tremor occurring when eyes are directed to extreme left or right ( levoversion or dextroversion ) indicates a familiar strabismus. If tremor occurs when eyes gaze upward a tumor of the oculomotor nerve may be indicated.