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Erbium-YAG Laser Ablation: The Myth of 1-µm Penetration—Reply

Claudio Azzolini, MD; Pier Giorgio Gobbi, PhD; Rosario Brancato, MD
Arch Ophthalmol. 1998;116(6):830-831. doi:.
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We are grateful to Dr Berger for pinpointing an important concept, which was possibly understated in our article,1 ie, the distinction between subthreshold and above threshold interaction. Dr Berger's example is also helpful to clarify the ablation process occurring in hydrated solid tissues with Er-YAG radiation at 10 J/cm2 radiant exposure and 200-microsecond pulse length.

We would like to observe that the aim of our article was somewhat different, namely, providing the absorption parameters useful to characterize the interaction of different laser wavelengths with several fluid substitutes at unspecified energy densities and time durations. Attention was in fact devoted in our discussion to 2 main aspects: the unwanted dispersion of laser energy in the fluid before reaching the target tissue, and the shielding properties provided by the fluid for remote tissues against scattered radiation. Thus both subthreshold and above threshold conditions were involved. No mention was actually made to any tissue ablation depth, this not being the main goal of the article.


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June 1, 1998
Jeffrey W. Berger, MD, PhD
Arch Ophthalmol. 1998;116(6):830-831. doi:.
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