Circulatory Studies of the Fundus of the Eye.

OUR investigations assumed first that the difference of pressure between the arterial and venous parts of the capillary system acts as circulatory motor, further, that spontaneous venous pulsation of the fundus of the eye is a sign of a pressure prevailing within the central retinal vein lower than the intra-ocular tension. One hundred cases were examined: fifty of them showing spontaneous pulsation, the other fifty without such. Hardly any difference concerning number of hypertonics and hypotonics, ocular tension, age, sex and brachial blood-pressure could be distinguished between the two groups in question (see Table). With those cases in which no