Laser thermokeratoplasty: a comparative in-vitro study with an Er:glass and a Cr:Tm:Ho:YAG laser

Ralf Brinkmann; Detlef Micka; Ch. Strunge; C. Nowack; E. El-Hifnawi

doi:10.1117/12.137435

14 August 1992 Laser thermokeratoplasty: a comparative in-vitro study with an Er:glass and a Cr:Tm:Ho:YAG laser

Ralf Brinkmann, Detlef Micka, Ch. Strunge, C. Nowack, E. El-Hifnawi

Proceedings Volume 1644, Ophthalmic Technologies II; (1992) https://doi.org/10.1117/12.137435
Event: OE/LASE '92, 1992, Los Angeles, CA, United States

Abstract

Laser thermokeratoplasty is a relatively new concept to correct hyperopia and astigmatism by placing coagulation spots into the corneal stroma around the optical center. A comparative study with an Er:Glass- (wavelength (lambda) equals 1.54 micrometers ) and a Cr:Ho:Tm:YAG-laser ((lambda) equals 2.12 micrometers ) has been started using different application systems; a bare fiber tip in contact to the cornea surface in the case of working with the Er:Glass-radiation and a non-contact focusing device in the case of applying the Cr:Tm:Ho:YAG-laser energy. Results in change in the corneal power of refraction up to 7 diopters demonstrate the capability of this method. Histological data of pulse energies up to 30 mJ of Er:Glass-radiation show the depth of the coagulation cones inside the corneal stroma and give proof of no alteration to the endothelium and Descemet's membrane.

Citation Download Citation

Ralf Brinkmann, Detlef Micka, Ch. Strunge, C. Nowack, and E. El-Hifnawi "Laser thermokeratoplasty: a comparative in-vitro study with an Er:glass and a Cr:Tm:Ho:YAG laser", Proc. SPIE 1644, Ophthalmic Technologies II, (14 August 1992); https://doi.org/10.1117/12.137435

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