[On the appearance of the eye fundus in polycythaemia vera (author's transl)].

The authors discuss the ophthalmological and physical symptoms of polycythaemia vera. They established that the severity of the changes in the fundus depend in the same way on the red cell count and the duration of the illness. In an attempt to find the cause of the complications communicated in the literature in arterial spasm and venous stasis, the authors compared statistically the less severe cases and those cases with arterial stenosis which can also be found in uncomplicated cases, and the cases with venous stasis.

Examination of chromatic adaptation.

The author describes a simple self-constructed apparatus which is suitable to perform investigations on adaptation in four domain of the spectrum. He considers the apparatus as appropriate to examine acquired colour vision deficiencies.

Immunological investigations on patients with transplanted cornea: the role of tissue antigens in keratoplasty.

After briefly describing the conceptions of the HL-A antigens and of histocompatibility, the authors give an account of their own retrospective examinations in connection with keratoplasty. Transplantations between identical groups of the ABO-system have a greater probability of ending successfully, if at least 2 HL-A antigens of donor and recipient are identical; this being chiefly important when grafting is carried out into unfavourable, vascularized surroundings.