Erbium: Yag laser trabecular ablation with a sapphire optical fiber

M. Lisa McHam, Dan L. Eisenberg, Joel S. Schuman, Nan Wang

Research output: Contribution to journalArticlepeer-review


The purpose of the study was to evaluate the effect of erbium (Er): yttrium aluminum garnet (YAG) laser trabecular ablation with a Sapphire optical fiber on outflow facility. After obtaining baseline outflow facility using a computerized differential pressure perfusion system, human cadaver eyes were subjected to Er: YAG laser trabecular ablation using a sapphire optical fiber. Single pulses at varying energy levels (10 to 20 mJ pulse- 1) were applied in a nearly contiguous fashion over four clock hours of meshwork. Post-laser outflow facility was then determined utilizing the same perfusion system and histopathologic analysis performed. Of the ten eyes, nine were perfused to steady baseline facility. One eye was excluded from the study because of a leak in our system during the initial perfusion. The mean baseline facility was 0.283 ± 0.08 μl min-1 mmHg-1. There was a significant increase in outflow facility after trabecular ablation, with a mean post-laser facility of 0.62 ± 0.15 μl min-1 mmHg-1 (P = 0.01). Eyes which received a sham treatment showed no increase or a minimal increase in facility. Histopathologic analysis revealed ablation into Schlemm's canal with some thermal damage to the outer wall at all energy levels. Er: YAG laser trabecular ablation with a sapphire fiber is capable of increasing outflow facility in human cadaver eyes.

Original languageEnglish (US)
Pages (from-to)151-155
Number of pages5
JournalExperimental Eye Research
Issue number2
StatePublished - Aug 1997


  • Erbium
  • Filtration surgery
  • Glaucoma
  • Laser
  • Trabecular meshwork
  • YAG

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems
  • Cellular and Molecular Neuroscience


Dive into the research topics of 'Erbium: Yag laser trabecular ablation with a sapphire optical fiber'. Together they form a unique fingerprint.

Cite this