Physiology of the Eye by Hugh Davson DSc (Lond) (auth.)

By Hugh Davson DSc (Lond) (auth.)

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The Aqueous Humour and the Intraocular Pressure concentration in the aqueous humour reaches some 50 mg/loo ml. Raising the plasma level beyond the saturation level causes no further rise in concentration in the aqueous humour. According to Linner (1952) the ability of the eye to maintain this concentration of ascorbic acid depends critically on the blood-flow , so that unilateral carotid ligation causes a 17% fall in concentration on the Iigatured side. Hence, under non-saturation conditions, the concentration of ascorbic acid in the aqueous humour is some measure of the rate of blood-flow through the ciliary body.

1981). Diabetic Retinopathy Retinal degeneration, as in diabetic retinopathy or retrolental fibroplasia, is followed by the appearance of new retinal vessels, 25 stimulated apparently by the retinal anoxia and degeneration. This vascular proliferation is accompanied by increased permeability of the blood-retinal barrier; thus, employing an accurate quantitative technique for measuring penetration of fluorescein into the vitreous body, Lund-Andersen et 0/. 1 ern sec-I . Examination of the capillaries of the diabetic retina demonstrates the presence of open tight junctions (Taniguchi, 1976; Wallow & Geldner, 1980).

Diffusion from Iris While in the posterior and anterior chambers, however, the aqueous humour is subjected to diffusional exchanges with the blood in the iris, as illustrated in Fig. 25,so that if these exchanges are significant the rate at which the foreign substance comes into equ ilibr ium with the aqueous humour is increased. There is no doubt that lipidsolubility is an important factor in determining the rapidity of these diffusional exchanges. The anterior surface of the iris is not covered by an intact epithelial or endothelial layer, so that restraint on diffusion from blood into the anterior chamber must depend on the capillaries of this tissue .

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