Laser scleral buckling: In vitro quantification for Ho:YAG and TmrYAG lasers

Mikio Sasoh, Jean Marie Parel, Izuru Nose, Jin Hui Shen, Jason Comander, William E. Smiddy

Research output: Contribution to journalConference articlepeer-review


Pilot studies for laser scleral buckling made it clear that quantification of scleral shrinkage was required for precision and reproducibility of the treatment. For the quantification either the Ho:YAG (2.10 μm) or the TmrYAG (2.01 μm) lasers were applied to the equatorial sclera of human cadaver eyes. Two slightly overlapping spots (2.8mmØ) were applied. Shrinkage rate was expressed as: {(Scleral length before treatment - Scleral length after treatment)/Scleral length before treatment} x 100 (%). Shrinkage rate was measured changing several parameters. Total fluence, energy/pulse, scleral thickness, tissue temperature, age, and intraocular pressure. Shrinkage rate was found to be mainly function of total fluence attaining a maximum of 26-30% in adult and 46% in infant eyes at a 3-4mmHg intraocular pressure. Rising tissue temperature from room temperature to physiologic levels reduced the laser energy requirements but not the maximum shrinkage level. From the same shrinkage effect in the practical range of total fluence, less energy (56-60%) was required with the Tnr.YAG laser. The data acquired in this study will help us construct an algorithm to predict the outcome of laser scleral buckling in patients.

Original languageEnglish (US)
Pages (from-to)299-305
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - May 22 1995
EventOphthalmic Technologies V 1995 - San Jose, United States
Duration: Feb 1 1995Feb 28 1995

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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