Outflow resistance of enucleated human eyes at two different perfusion pressures and different extents of trabeculotomy

Curr Eye Res. 1989 Dec;8(12):1233-40. doi: 10.3109/02713688909013902.


Aqueous outflow resistance of enucleated human eyes was measured at 7 and 25 mm Hg before and after partial and complete (12 clock hours) internal trabeculotomy. Following complete trabeculotomy, 71% of the resistance was eliminated at 25 mm Hg while only 49% was eliminated at 7 mm Hg. In contrast to published findings in eyes with intact trabecular meshwork where the resistance increased with increasing IOP (1), following complete trabeculotomy, the resistance decreased 2% per mm Hg with increasing IOP. Experiments with trabeculotomy limited to part of the circumference showed that a one hour trabeculotomy produced 41% (25 mm Hg) to 60% (7 mm Hg) of the effect of a twelve hour trabeculotomy. The results indicate that a surprisingly high fraction of aqueous outflow resistance resides in the distal aspects of the outflow system at normal IOP, and that this distal resistance drops as IOP is increased.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Aged
  • Analysis of Variance
  • Anterior Chamber / metabolism
  • Aqueous Humor / metabolism*
  • Eye Enucleation*
  • Female
  • Humans
  • Male
  • Manometry
  • Middle Aged
  • Perfusion
  • Pressure
  • Trabeculectomy*