Ophthalmology science · 2024
Advanced Optical Analysis of Divergence Between the Foci of the Neodymium-Doped Yttrium Aluminum Garnet (Nd:YAG) and Aiming Beam Lasers.
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Averbukh Edward, Slushetz Yaakov, Levy Jaime, Patal Rani, Mandelbaum Yaakov, Arieli Yoel
Аннотация
PURPOSE: To evaluate the divergence between the neodymium-doped yttrium aluminum garnet (Nd:YAG) surgical laser and the aiming diode laser beams foci.
DESIGN: Optical analysis and measurements were performed using a Volk Goldmann 3-mirror lens with a Nidek YC-1800 Nd:YAG laser apparatus.
SUBJECTS: None.
METHODS: We used the Zemax OpticStudio program for the model of Nd:YAG treatment in a human eye. Additionally, theoretical calculations were performed.
MAIN OUTCOME MEASURES: The divergence between the Nd:YAG laser focus and the intersection of the 2 aiming beams inside the eye.
RESULTS: Focal points of the 2 laser beams converge 8 mm behind the cornea. Posterior to this point, the intersection of the diode laser aiming beams lies in front of the focal point of the Nd:YAG treatment laser, with distance between the 2 foci progressively increasing up to 305 microns at 24 mm behind the cornea.
CONCLUSIONS: We report the degree of divergence between the 2 lasers' focal points due to the difference in refraction between the corresponding wavelengths. These results have high practical relevance, as they provide a starting point for increasing the accuracy of Nd:YAG laser treatment, particularly when applied to the posterior segment, thereby minimizing the risk of complications. Current Nd:YAG laser devices have the built-in ability to modify the focal point of the aiming beam along the z-axis, thus providing possibility for an immediate application of our findings in clinical practice.
FINANCIAL DISCLOSURES: The authors have no proprietary or commercial interest in any materials discussed in this article.
DESIGN: Optical analysis and measurements were performed using a Volk Goldmann 3-mirror lens with a Nidek YC-1800 Nd:YAG laser apparatus.
SUBJECTS: None.
METHODS: We used the Zemax OpticStudio program for the model of Nd:YAG treatment in a human eye. Additionally, theoretical calculations were performed.
MAIN OUTCOME MEASURES: The divergence between the Nd:YAG laser focus and the intersection of the 2 aiming beams inside the eye.
RESULTS: Focal points of the 2 laser beams converge 8 mm behind the cornea. Posterior to this point, the intersection of the diode laser aiming beams lies in front of the focal point of the Nd:YAG treatment laser, with distance between the 2 foci progressively increasing up to 305 microns at 24 mm behind the cornea.
CONCLUSIONS: We report the degree of divergence between the 2 lasers' focal points due to the difference in refraction between the corresponding wavelengths. These results have high practical relevance, as they provide a starting point for increasing the accuracy of Nd:YAG laser treatment, particularly when applied to the posterior segment, thereby minimizing the risk of complications. Current Nd:YAG laser devices have the built-in ability to modify the focal point of the aiming beam along the z-axis, thus providing possibility for an immediate application of our findings in clinical practice.
FINANCIAL DISCLOSURES: The authors have no proprietary or commercial interest in any materials discussed in this article.