Abstract
Some time ago, Weber [1], Schulten [2], Koster [3–6], Schiotz [7–11], etc., tried to relate variations in intraocular volume with the pressure changes induced by these volume changes. These experiments were conducted in enucleated eyes of animals and man. It is not easy to measure both values. The experiment consists in introducing a cannula or injection needle into the eye, connecting the eye with a manometer and taking the pressure directly with a tonometer. A known volume of fluid is injected in the eye and the pressure is measured before and after; the operation is repeated as many times as needed. In that way, the variations in volume introduced with the pressure variations obtained can be correlated in a chart. This was what Friedenwald did with the data provided by the authors mentioned above. A variation in volume is estimated in this way: $$ {V}_{2}-{V}_{1}$$ indicating a change in pressure $$ {P}_{2}-{P}_{1}$$
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