Volume 18, Issue 4 (Journaloflasersinmedicine 2022)
lmj 2022, 18(4): 60-60 |
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Jalili P, Maghouli K, Jadidi K. A three-dimensional optical model to describe the optical function
of the keratoconus eye. lmj 2022; 18 (4) :60-60
URL: http://icml.ir/article-1-549-en.html
URL: http://icml.ir/article-1-549-en.html
Biomedical Engineering (Bioelectric), Faculty of Medical Sciences and Technologies, Science and Research Branch, Islamic Azad University, Tehran, Iran
Abstract: (1104 Views)
Object: Keratoconus (KC) is a noninflammatory progressive corneal degeneration in which the cornea becomes thinner and eventually protrudes and assumes a cone-like shape. The corneal protrusion causes irregular astigmatism, affecting visual quality. Modeling the optical function of the keratoconus eye is the main object of this study.
Materials and Methods: Using the clinical corneal topographic data, including radius of curvature and elevation, a three-dimensional model, based on the ray tracing method and Snell's law was developed, to evaluate the optical function of the keratoconus eye before and after implantation. Also, to calculate the aberrations of eye, the expansion method in terms of Zernike polynomials was used. In addition, patient clinical aberration maps were used to validate the model.
Results: By radiating a plane wave to the patient's eye, the wavefront as well as the spot diagram on the retina were reconstructed. The retina spot diagram showed that higher order aberrations also appear under these conditions. Using Zernike coefficients, the amount of different aberrations of eye was investigated. The results of general ocular aberration were in good agreement with clinical data.
Conclusion: The proposed model calculates the optical path difference for each ray, the wavefront error, and the various types of eye’s aberration maps. Using this model and methods for predicting corneal topography after ring implantation, physicians can be assisted in selecting the appropriate ring before surgery.
Materials and Methods: Using the clinical corneal topographic data, including radius of curvature and elevation, a three-dimensional model, based on the ray tracing method and Snell's law was developed, to evaluate the optical function of the keratoconus eye before and after implantation. Also, to calculate the aberrations of eye, the expansion method in terms of Zernike polynomials was used. In addition, patient clinical aberration maps were used to validate the model.
Results: By radiating a plane wave to the patient's eye, the wavefront as well as the spot diagram on the retina were reconstructed. The retina spot diagram showed that higher order aberrations also appear under these conditions. Using Zernike coefficients, the amount of different aberrations of eye was investigated. The results of general ocular aberration were in good agreement with clinical data.
Conclusion: The proposed model calculates the optical path difference for each ray, the wavefront error, and the various types of eye’s aberration maps. Using this model and methods for predicting corneal topography after ring implantation, physicians can be assisted in selecting the appropriate ring before surgery.
Educational: Research |
Subject:
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Received: 2020/10/26 | Accepted: 2020/12/10 | Published: 2020/12/30
Received: 2020/10/26 | Accepted: 2020/12/10 | Published: 2020/12/30
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