The Honan intraocular pressure reducer. An experimental study
P. J. McDonnell, H. A. Quigley, A. E. Maumenee, W. J. Stark and G. M. Hutchins
Although use of the Honan intraocular pressure reducer is believed to be
clinically safe and effective in reducing IOP and the risk of vitreous
loss, the IOPs achieved during application of the device have not been
directly measured. Intraocular pressure dynamics in ten eyes of five
patients were measured shortly after death, using a pressure transducer
within the anterior chamber as the Honan device was applied. Pressures were
measured again after enucleation. The peak IOPs produced in eyes in situ
were much lower than in the same eyes after enucleation. The peak IOP
increased as the initial IOP was raised. The Honan device would appear to
be safe for eyes undergoing routine anterior segment surgery, but the
pressures that may be generated in hypertensive eyes (IOP greater than or
equal to 35 mm Hg) might put these eyes at risk for vascular occlusion.
