Averbukh E, Slushetz Y, Levy J, Patal R, Mandelbaum Y, Arieli Y. Advanced Optical Analysis of Divergence Between the Foci of the Neodymium-Doped Yttrium Aluminum Garnet (Nd:YAG) and Aiming Beam Lasers.
OPHTHALMOLOGY SCIENCE 2024;
4:100512. [PMID:
38881607 PMCID:
PMC11179403 DOI:
10.1016/j.xops.2024.100512]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 02/11/2024] [Accepted: 03/08/2024] [Indexed: 06/18/2024]
Abstract
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.
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