PURPOSE: To determine the stress wave amplitudes generated during photoablation of the @entity267 using an @entity28691 excimer laser. DESIGN: Experimental study using porcine eyes. METHODS: Profiles of the stress wave amplitudes and enucleated @entity1 eyes along the axis of symmetry of porcine eyes and enucleated @entity1 eyes were measured using a miniature piezoelectric transducer. The ablation parameters, fluence, and ablation diameters were varied within the range of clinical application. MAIN OUTCOME MEASURES: Stress wave amplitudes generated during photoablation. RESULTS: The stress waves pass through a pressure focus located in the posterior lens and anterior vitreous, where amplitudes of up to 100 atm were measured with a 6-mm or larger ablation zone. Posterior to this focus, the stress wave amplitudes rapidly decrease to less than 10 atm at the retinal site. Small diameter excimer laser spots (< or =1.5 mm) produce a declining stress wave with no pressure focus at the lens and anterior vitreous. CONCLUSIONS: Stress waves may be potentially hazardous to anterior structures of the @entity1 eye, including the corneal endothelium, lens and anterior vitreous face. They peak at the lens and vitreous with a broad beam, but not with small spot laser ablation. At posterior retinal and subretinal structures, they may be considered harmless.

Stress wave amplitudes during laser surgery of the XXXX .

@entity1 :: ('9606', 'Species') :: ['human'] @entity28691 :: ('MESH:C047730', 'Chemical') :: ['argon fluoride'] @entity267 :: ('MESH:D065306', 'Disease') :: ['cornea']
@entity267 :: (MESH:D065306,Disease) :: ['cornea']
