Corneal transmissibility of diode versus argon lasers and their photothermal effects on the cornea and iris

Clinical & Experimental Ophthalmology
P T ChewE P Tock

Abstract

Diode laser (810 nm) may possess theoretical advantages over the argon blue-green laser (488 nm) for iridotomy/iridoplasty in an eye with oedematous cornea, such as the acute angle-closure glaucoma (AACG) patient, because of better diode laser tissue penetration in opaque media. We assessed the transmissibility of diode and argon lasers through corneas of varying clarity and evaluated the histopathological features of cornea and iris burns produced by these lasers. The transmission of diode and argon lasers through human donor corneal buttons of three grades of clarity--clear, intermediate, and hazy--were compared. Corneal buttons of these varying levels of clarity were also treated with argon and diode lasers, with the beams deliberately focused onto the mid-stroma to assess their photothermal effects. Exposed pigmented irides from whole human eyes were treated directly with argon and diode lasers. The lasers were delivered via slit-lamp systems and the energy settings used were 1000 mW for argon and 980 mW for diode; spot sizes for both lasers were 100 microm, with exposure durations of 0.1 s. Light microscopy studies of these tissues were performed. Transmissibility of diode laser in clear, intermediate, and hazy corneas wer...Continue Reading

References

Mar 15, 1992·American Journal of Ophthalmology·I EmotoA Nakajima
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Jan 1, 1991·Lasers in Surgery and Medicine·A VogelR Birngruber
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Citations

Mar 23, 2011·Biomacromolecules·Abigail M OelkerMark W Grinstaff
May 3, 2007·Survey of Ophthalmology·Robert RitchDennis S C Lam
May 1, 2012·International Journal for Numerical Methods in Biomedical Engineering·Arunn Narasimhan, Kaushal Kumar Jha
Mar 21, 2002·Journal of Clinical Laser Medicine & Surgery
Nov 5, 2019·Nanomedicine : Nanotechnology, Biology, and Medicine·Ramin Khademi, Abolhassan Razminia

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