[The Goldmann Memorial Lecture--historical and current aspects of stereopsis]. / Goldmann-Gedächtnisvorlesung--Historische und aktuelle Aspekte der Stereopsis.

According to Goldmann stereopsis is the highest performance of binocular recognition. A historical review shows that binocular stereopsis was explained only in 1838 by Wheatstone, whereas the monocular clues for stereopsis e.g. size, position and covering of the objects, light and shadow, perspective of the air, parallax and linear perspective were known long ago. The denomination depth perception is ambiguous: "depth" is the opposite of "height". Stereopsis means natural recognition of distance and objects in space, stereoscopy means recognition by the aide of an instrument. Natural and dichoptic stereopsis and the influences of vertical structures, of pupillary distance and of astigmatism are discussed. Examination of stereopsis is discussed, among others the two pencil test, the stereo-modification Bagolini-glasses, the combination of the plano-cylinders of W. R. Hess with random dots without glasses, the disk stereopsis etc. Goldmann's theory of binocular vision helps to understand different forms of strabismus, e.g. the statistical interplay of fixation and fusion for microtropia, the fixation mechanism for the congenital strabismus syndrome, the use of binocular stereopsis only for near explains intermittent divergence.

[On the history of the teaching of squint (author's transl)]. / Zur Geschichte der Lehre vom Strabismus.

After an introduction on the value of history also from modern medicine, the teaching of strabismus from the earliest begin at the time of Hammurapis (1700 BC) up to our times is broadly described. The old greek and latin ideas are analysed linguistically. The work of Johannes Müller and Emil Javel is especially emphasized with regard to advances in the teaching of squint and its treatment. Landolt, Maddox, Sattler and Bielschowsky above all have usefully completed these aspects. The knowledges over squint which were forgotten in many places in the first third of our century were rediscovered and considerably extended, at first by Worth, and later especially by Lyle, Bangerter, Hugonnier, Cüppers, and last but not least Heinrich Harms.