For 66 years I have given much thought to binocular vision. Why I have found it such a fascinating subject for study I do not exactly know. Perhaps it is because it has involved my making so many interesting experiments and conclusive demonstrations with the aid only of drawing materials and a stereoscope.* I have published new concepts and tests of binocular vision, yet none of these concepts has been generally accepted. This is not because they are incorrect, for none has been disproved, but because they differ so greatly from prevailing views that they have not been understood. In the past I have given more attention to the sensory than the motor aspects of binocular vision; now I shall deal chiefly with its motor aspects.
We know a great deal about what the motor mechanisms of the brain can do and have named and classified them on this basis,
VERHOEFF FH. New Concepts Concerning Ocular Motility. Arch Ophthalmol. 1963;70(3):328-332. doi:10.1001/archopht.1963.00960050330009