Measurement of eccentric fixation by the Bjerrum screen.

Introduction by G. W. Black andJ. Foster.-The forward movement of orthoptic technique between 1925 and 1935 depended on a re-appreciation of the importance of anomalous retinal correspondence, measured by the improved synoptophores then available. Before this, many patients had been wasting their time on unsupervised divergence exercises. In this decade Ciippers's discovery of the high percentage of amblyopic eyes with eccentric fixation which are detectable by the Visuscope and undetectable by the synoptophore, is likely to have a similar effect on the occlusion treatment of amblyopia. The collaboration of Miss R. Downey (Orthoptist) and Mr. G. Brockbank (Ophthalmic Optician) at the Leeds General Infirmary has produced a subjective method which will (when applicable) detect an even smaller degree of eccentric fixation, and is, we think, of importance in view of the enormous effort that pleoptic treatment requires both from patient and therapist.