The effect of water content on the 193 nm excimer laser ablation

Abstract

For a constant laser energy output, lower water content materials ablated to a greater extent than higher water content materials. This model provides a simple way to assess the effect of water content and dehydration on myopic laser in situ keratomileusis.

Effect of time sequences in scanning algorithms on the surface temperature during corneal laser surgery with high-repetition-rate excimer laser

“…[19][20][21][22][23][24][25][26] However, to our knowledge, the laser beam repetition rate above 50 Hz has not been thoroughly studied. 27 This problem is important as high-repetition-rate excimer lasers are of interest in obtaining a high speed ablation with short treatment times.…”

Experimental setup to determine the pulse energies and radiant exposures for excimer lasers with repetition rates ranging from 100 to 1050 Hz

“…To our knowledge, all studies of the effect of corneal hydration found a reduction in ablation depth per pulse with an increase in corneal hydration. [17][18][19]31,32 However, it is unlikely that the reduction in ablation depth in our study was associated with an increase in corneal hydration because the applied laser power increases with the repetition rate; therefore, one might expect a dehydration effect rather than a hydration effect. On the other hand, possible thermocapillary effects might increase in the underlying stromal structures.…”

“…[13][14][15][16] Nevertheless, the peak temperatures might play a role in high-repetition-rate scanningspot laser platforms because the deposited average temperature increases 6 or because underlying tissue structures might change their ablation behavior due to dehydration or denaturation. [17][18][19][20] Both factors have an influence on the ablation depth per pulse for the subsequent laser pulses during a series of laser pulses for a refractive treatment.…”

Influence of spatial and temporal spot distribution on the ocular surface quality and maximum ablation depth after photoablation with a 1050 Hz excimer laser system

“…Normally, the dependence of the ablation depth on the radiant exposure typical for single pulse regimes and on the repetition rate (limited to about 50 Hz) 17-24 is reported. In addition, the ablation plume dynamics considering scanning approaches or an aspiration of the ablation plume 14,[25][26][27][28][29] and the relevance of corneal hydration [30][31][32][33][34][35][36] are reported for low repetition rates and nonscanning approaches. No information reporting high repetition rate excimer lasers and different scanning sequences for corneal laser surgery can be found in the literature.…”