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ABSTRACT.Purpose: To study the effect of exercise on the configuration of the anterior chamber angle in healthy persons. Methods: Both eyes of 22 healthy persons were scanned by Ultrasound Biomicroscopy. Before and after 10 minutes of exercise the anterior chamber angle and the area of the peripheral anterior chamber were measured on the scannings. Results: After exercise the anterior chamber angle/peripheral area increases in all eyes due to changes in the iris configuration. The myopic group shows the largest change. Conclusion: Reverse pupillary block (iris concavity) is not pathognomonic in pigmentary glaucoma, it occurs in all normal eyes after exercise, most pronounced in myopics. Consequently, the difference between physiological and pathological reverse pupillary block has to be clarified.Key words: iris concavity -iris anatomy -exercise -healthy eyes -myopia -pigment dispersion syndrome -pigmentary glaucoma -reverse pupillary block -ultrasound biomicroscopy.

Nissen, 0. 1. The magnitude of the skimming phenomenon in the interlobular arteries of the cat kidney. Acta physiol. scand. 1965. 64. 87-92. -Samples simultaneously collected from the arterial system, from the deep renal veins and from the subcapsular renal veins in the cat kidney have been analysed with respect to red cell volume, plasma proteins, plasma osmolality (and plasma PAH). The ratio : subcapsular venous concentration/arterial concentration was on an average 1.10 for the red cells, 1.09 for the plasma proteins, and 0.99 for plasma osmolality. The ratio: deep venous concentration/arterial concentration was on an average 0.90 for the red cells, 0.89 for the proteins, and 1.03 for the osmolality. The difference between the protein ratios and a part of the difference between the hematocrit ratios may be attributed to the fact that a part of the fluid lost by ultrafiltration from the blood traversing the outer cortex is reabsorbed in the loops of Henle and the collecting ducts and thus will be added to the blood leaving the kidney by way of the deep veins. A smaller part of the difference between the hematocrit ratios may he explained from the alterations in the tonicity of the blood during its passage through the kidney. I n 1956 Pappenheimer and Kinter proposed their wellknown cell-separation theory based on the phenomenon of plasma skimming described by Krogh (1929, p. 6). This skimming should occur in the interlobular arteries, the outer glomeruli thep receiving a cell-rich component of the blood and the deeper glomeruli a cell-poor component.A direct consequence of this cell-separation theory is that the blood leaving the superficial cortex should be cell-rich and that the blood flowing from the inner part of the cottex (and the medulla), cell-poor.According to v. Mollendorff (1930, pp. 133-1 35) the venous drainage of the cat kidney is characterized by the fact that the blood from a considerable, outer, part of the cortex passes to the well developed subcapsular veins which, confluenting, lead it along the surface of the kidney to the renal vein. The venous drainage from the medulla and the inner part of the cortex takes place, as in other mammals, through the arcuate veins.

The preliminary results of the new clear-cornea IDK seem promising because of postoperative IOP of about 10 mm Hg despite a low dose of mitomycin C and noncystic bleb morphology.

The fall in applanation pressure after intravenous acetazolamide was followed in seven patients with normal intraocular pressures and in five patients with monolateral glaucoma. The experimental pressure decay curves were compared with similar curves calculated on the basis of different values for the facility of outflow of aqueous humour, and on the assumption of a prompt shift in the rate of aqueous secretion from the preinjectional level to a stable acetazolamide dominated level. The experimental decay curves resembled the matching, calculated curves. The outflow facilities read from the latter averaged 0.4 (range 0.2-1.0) in the normal eyes, and 0.1 (range 0.05-0.15) in the glaucomatous eyes. These results strongly indicate that the above-mentioned assumptions are justified, and that the method allows a simultaneous estimation of outflow facilities in the right and left eye at pressures below the usual. W e find that a study of the shape of the decay curves in glaucomatous eyes might give a clue to the problem of whether the hindrance to the drainage of aqueous humour in the diseased Schlemm system shows reversibility under the decompressing effect of the falling intraocular pressure.