DIVERGENCE EXCESS

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Abstract
At the Tenth International Congress of Ophthalmology in 1904, A. Duane read a paper on the evolution of squint. In his opinion nonparalytic divergent squint develops either from insufficiency of convergence or from excess of divergence or from a combination of the two. He considered divergence excess to be produced by overactivity of the center controlling the divergence movements. In his opinion it is secondary in about two thirds of the cases, following primary insufficiency of convergence, and is primary in only one third, manifesting itself in the beginning as marked exophoria with excessive prism divergence for distance vision, but only slight exophoria for near vision and with a continuing normal near point of convergence. Gradually there develops manifest squint for distance with a further increase in the prism divergence, but the near point of convergence is still normal. Finally, after a gradual recession of the near point,

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