title: The comparative histologic effects of subthreshold 532- and 810-nm diode micropulse laser on the retina.
abstract: OBJECTIVE
  Therapeutic retinal laser photocoagulation can damage the neurosensory retina and cause iatrogenic visual impairment. Subthreshold micropulse photocoagulation may decrease this risk by selective tissue treatment. The aim of this study was to compare subthreshold 810-nm diode micropulse laser and subthreshold 532-nm micropulse laser on the retina by histologic examination and differential protein expression.
  
  
  METHODS
  Fourteen Dutch-belted rabbits received subthreshold 810-nm diode micropulse laser photocoagulation in their right eye and subthreshold 532-nm micropulse laser photocoagulation in their left eye. Histology and immunohistochemical detection of stromal cell-derived factor-1 (SDF-1), β-actin, vascular endothelial growth factor (VEGF), glial fibrillary acidic protein (GFAP), and insulin-like growth factor 1 (IGF-1) were analyzed 12 hours, 3 days, 14 days, and 28 days post-laser photocoagulation.
  
  
  RESULTS
  Histologically, all time points produced a similar degree of retinal disruption in both wavelengths. Immunohistochemically, SDF-1 expression was greatest at the 12-hour time point and decreased thereafter. SDF-1, VEGF, and β-actin up-regulation was detected at early time points in both the 810- and 532-nm micropulse laser-treated animals.
  
  
  CONCLUSIONS
  Subthreshold micropulse retinal laser photocoagulation caused equivalent histologic changes from both 532- and 810-nm diode lasers. Differential protein expression was not evident between the different laser conditions.
authors: University of California-Davis, Department of Ophthalmology and Vision Science, Sacramento, California, USA.
authors: Alfred K
authors: AK
authors: Yu
authors: Kevin D
authors: KD
authors: Merrill
authors: Steven N
authors: SN
authors: Truong
authors: Krisztina M
authors: KM
authors: Forward
authors: Lawrence S
authors: LS
authors: Morse
authors: David G
authors: DG
authors: Telander
mesh_terms: D000818:Animals; D015415:Biomarkers / Q000378:metabolism; D005136:Eye Proteins / Q000378:metabolism; D007150:Immunohistochemistry; D017075:Laser Coagulation / Q000009:adverse effects* / Q000379:methods; D011817:Rabbits; D012160:Retina / Q000378:metabolism / Q000473:pathology / Q000528:radiation effects*
chemical_list: D015415:Biomarkers; D005136:Eye Proteins