Refractive analysis of the human cornea through propagated fields

Illueca, Carlos; Mas, David; Pérez, Jorge; Pons, A.; Artigas, José María Gatell

doi:10.1080/09500340010011691

Cited by 3 publications

(4 citation statements)

References 14 publications

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“…The method calculates the corneal transmittance from height data from the first and second corneal surface and local corneal thickness. From the transmittance function, the propagated light pattern or the modulated transfer function can be calculated at any desired plane [ 9 , 10 ]. Common method based on ray tracing needs impact dots statistics to obtain the final energy in a plane, thus imposing a different sampling grid at each considered axial distance.…”

Section: Introductionmentioning

confidence: 99%

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Corneal Stability following Hyperopic LASIK with Advanced Laser Ablation Profiles Analyzed by a Light Propagation Study

Gharaibeh

Villanueva

Mas

et al. 2018

Journal of Ophthalmology

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Purpose To assess anterior corneal surface stability 12 months following hyperopic LASIK correction with a light propagation algorithm. Setting Vissum Instituto Oftalmológico de Alicante, Universidad Miguel Hernández, Alicante, Spain. Methods This retrospective consecutive observational study includes 37 eyes of 37 patients treated with 6th-generation excimer laser platform (Schwind Amaris). Hyperopic LASIK was performed in all of them by the same surgeon (JLA) and completed 12-month follow-up. Corneal topography was analyzed with a light propagation algorithm, to assess the stability of the corneal outcomes along one year of follow-up. Results Between three and twelve months postoperatively, an objective corneal power (OCP) regression of 0.39 D and 0.41 D was found for 6 mm and 9 mm central corneal zone, respectively. Subjective outcomes at the end of the follow-up period were as follows: 65% of eyes had spherical equivalent within ±0.50 D. 70% of eyes had an uncorrected distance visual acuity 20/20 or better. 86% of eyes had the same or better corrected distance visual acuity. In terms of stability, 0.14 D of regression was found. No statistically significant differences were found for all the study parameters evaluated at different postoperative moments over the 12-month period. Conclusions Light propagation analysis confirms corneal surface stability following modern hyperopic LASIK with a 6th-generation excimer laser technology over a 12-month period.

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Section: Introductionmentioning

confidence: 99%

“…Our method avoids this problem so results are more accurate. Because of this, the method is computationally very efficient, allowing the evaluation of more than 10,000 elevation points simultaneously, thus allowing a very realistic modelling of the cornea [ 9 , 11 ].…”

Section: Introductionmentioning

confidence: 99%

Corneal Stability following Hyperopic LASIK with Advanced Laser Ablation Profiles Analyzed by a Light Propagation Study

Gharaibeh

Villanueva

Mas

et al. 2018

Journal of Ophthalmology

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“…The method used is based on a Fresnel’s propagation algorithm, used and described by Illueca et al In this case, the analytical approach has been modified to avoid taking into account axial length in order to study the simulated behaviour of the light around the best plane provided for the treated cornea, and to isolate the generated DOF. The Optical and Vision Science Group, University of Alicante, developed both programs, the ocular propagation and the path through the cornea …”

Section: Methodsmentioning

confidence: 99%

Long‐term corneal multifocal stability following a presbyLASIK technique analysed by a light propagation algorithm

Villanueva

Vargas

Mas

et al. 2019

Clinical and Experimental Optometry

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Background: There is a lack of scientific evidence on long-term follow-up of the outcomes of the presbyLASIK techniques. This study aimed to objectively evaluate corneal stability three years following excimer laser central presbyLASIK.Methods: This is a longitudinal, retrospective, observation of a consecutive series of cases comprising 24 eyes which had been treated by central myopic or hyperopic Presbymax central presbyLASIK. Eyes treated with the same version of presbyLASIK software were included and followed by corneal topography at three months, one and three years after surgery. Based on the corneal topography data, customised softwarebased on a light propagation algorithm and developed using Matlab softwarewas used to analyse the simulated behaviour of light through the ocular media. The range of objective corneal depth of focus was also measured. Results: Results were assessed separately for myopes and hyperopes at pupillary diameters of 3.0 and 6.0 mm. The results showed corneal multifocality outcomes to remain constant (p > 0.05) throughout the three-year follow-up period. Conclusion: The use of light propagation analysis of the multifocal anterior corneal surface following a Presbymax central presbyLASIK procedure demonstrated stable outcomes over a three-year follow-up period.

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“…Fast algorithms for the numerical calculation of Fresnel patterns have been studied by a number of authors [7][8][9][10][11][12][13][14][15]. The elegant and simple result reported here can be very useful for the development of such algorithms, which can be applied to different fields of optics, such as the calculation of defocused Fresnel images [16], the propagated fields inside a theoretical eye [17][18][19], and the computation of the average phase of a beam over a detector in the near field for the Space Interferometry Mission [20].…”

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Phase change in a diffracted wave: a Cornu spiral perspective

Ávila

Castaño

2010

Opt. Lett.

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A simple evaluation of the phase change in a diffracted wave, in terms of the Cornu spiral, is presented to complement the well-known intensity change, which is routinely obtained for this elegant graphical construction of the Fresnel integrals. This is, to the best of our knowledge, the first presentation of this evaluation. It is shown that the phase of a wave diffracted by a slit is equal to the slope of the line tangent to the Cornu spiral, shifted by π/4.

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Refractive analysis of the human cornea through propagated fields

Cited by 3 publications

References 14 publications

Corneal Stability following Hyperopic LASIK with Advanced Laser Ablation Profiles Analyzed by a Light Propagation Study

Corneal Stability following Hyperopic LASIK with Advanced Laser Ablation Profiles Analyzed by a Light Propagation Study

Long‐term corneal multifocal stability following a presbyLASIK technique analysed by a light propagation algorithm

Phase change in a diffracted wave: a Cornu spiral perspective

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