The influence of changes in the intraocular circulation on the intraocular pressure / by E.E. Henderson and E.H. Starling.

  • Henderson, Edward Erskine, 1870-1929.
Date:
1904
Catalogue details

Licence: In copyright

Credit: The influence of changes in the intraocular circulation on the intraocular pressure / by E.E. Henderson and E.H. Starling. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

    4/18 (page 306)
    introduced into the anterior chamber. This needle may be open at the end, or may be closed at the end and be provided with a lateral opening. Connected with the needle is a capillary glass tube with a T-piece, Fig. 1. A, intraocular pressure cannula, connected by pressure tubing with B, a piece of capillary tubing provided with a T-piece D. Through D is introduced the air bubble C. This serves as an indicator. The other end of the capillary tube is connected by means of a T-piece with the manometer E and the pressure bottle F. By adjusting the height of F to the various intraocular pressures no movement of the air bubble is allowed to take place. G is a piston-recorder connected with the top of the manometer. through which a bubble of air can be introduced into the tube. The capillary tube is connected again by a T-piece with a water manometer, and with a reservoir containing -9 °/0 of salt solution. In order to record the excursions of the manometer the air space over the column of fluid is connected by a rubber tube to a piston-recorder, and the delicacy of the piston-recorder was adjusted so that an excursion of 1cm. of its writing point denoted a change of pressure of about 5 cm. of water. Before introducing the needle into the anterior chamber the pressure in the apparatus was raised to about 25 cm. H20, which represents the ordinary intraocular pressure. While the fluid was dropping from the end of the needle it was thrust through the lateral part of the cornea so as to lie in the middle of the anterior chamber, and was supported in this position. A bubble was then introduced into the capillary tube, and the reservoir adjusted as quickly as possible to such a height that