New trends in intraocular lens imaging

Millán, Marı́a S.; Alba-Bueno, Francisco; Vega, F.

doi:10.1117/12.903389

Cited by 4 publications

(3 citation statements)

References 49 publications

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“… Key biometric parameters involved in IOL power calculation [ 2 , 3 , 31 , 32 , 33 , 34 , 35 ]. ACD = anterior chamber depth; AL = axial length; IOL = intraocular lens; K = keratometry.…”

Section: Figurementioning

confidence: 99%

Refractive Outcomes after Cataract Surgery

et al. 2022

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A post-operative manifest refractive error as close as possible to target is key when performing cataract surgery with intraocular lens (IOL) implantation, given that residual astigmatism and refractive errors negatively impact patients’ vision and satisfaction. This review explores refractive outcomes prior to modern biometry; advances in biometry and its impact on patients’ vision and refractive outcomes after cataract surgery; key factors that affect prediction accuracy; and residual refractive errors and the impact on visual outcomes. There are numerous pre-, intra-, and post-operative factors that can influence refractive outcomes after cataract surgery, leaving surgeons with a small “error budget” (i.e., the source and sum of all influencing factors). To mitigate these factors, precise measurement and correct application of ocular biometric data are required. With advances in optical biometry, prediction of patient post-operative refractory status has become more accurate, leading to an increased proportion of patients achieving their target refraction. Alongside improvements in biometry, advancements in microsurgical techniques, new IOL technologies, and enhancements to IOL power calculations have also positively impacted patients’ refractory status after cataract surgery.

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“… Key biometric parameters involved in IOL power calculation [ 2 , 3 , 31 , 32 , 33 , 34 , 35 ]. ACD = anterior chamber depth; AL = axial length; IOL = intraocular lens; K = keratometry.…”

Section: Figurementioning

confidence: 99%

Refractive Outcomes after Cataract Surgery

et al. 2022

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“…La calificación obtenida fue de "Sobresaliente -Cum Laude" (Junio de 2014). Las aportaciones y los resultados de la tesis, de los resultados derivados de la misma y de algunas aplicaciones al ámbito clínico están recogidas en las referencias [1][2][3][4][5][6][7][8][9][10][11]. El manuscrito completo se puede consultar en la referencia [12].…”

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Optical Characterization of Intraocular Lenses

Alba-Bueno¹,

Garcia-Varela²,

Vega³

2017

Opt. Pura Apl.

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ABSTRACT:The optical characterization of an intraocular lens (IOL) provides objective and quantitative information that is essential to fully understand its performance as an implant that replaces the crystalline lens in the human visual system. Additionally, it can be used to predict the performance of the new IOL designs. This characterization has to be carried out using in vivo tests in implanted patients and in vitro, by means of an optical bench or theoretical simulations. This thesis begins with an analysis of the main sources of uncertainty in the calculation of the IOL power and explores the compensation of the residual refractive errors by using some unconventional degrees of freedom. The thesis focuses on the in vitro characterization of a variety of commercially available IOLs (monofocal, multifocal, spherical, aspherical, apodized, full-aperture, and of different materials, powers and additions) in optical bench. To this end, we have designed and implemented the necessary methods of measurement and an experimental setup that, according to the international standard regulation, reproduces the conditions of such implants in the human eye. We have developed a method to measure the energy efficiency of IOLs. This method has allowed us to explain the clinical results obtained in the evaluation of the stereoscopic acuity when using two tests based on different principles. The optical imaging quality of IOLs has been basically quantified through the experimental measurement of the modulation transfer function. We have developed and implemented a method to characterize some artefact, named halo, which can be perceived by those patients implanted with multifocal IOLs. Finally, all the experimental results have been used as a basis for the inter-class comparison of the IOL performances.Key words: Intraocular lenses, optical quality, cataract, vision RESUMEN:La caracterización óptica de las lentes intraoculares (IOLs del inglés Intraocular Lenses) proporciona una información objetiva y cuantitativa que es necesaria para comprender su funcionamiento como implante que sustituye al cristalino en el sistema visual humano. Además, permite predecir el rendimiento de los nuevos diseños. Dicha caracterización se debe llevar a cabo mediante pruebas in vivo en pacientes ya implantados, así como con pruebas in vitro en banco óptico o mediante simulación teórica. La tesis comienza con un análisis de las fuentes de error en el cálculo de la potencia de las lentes intraoculares y explora la posible compensación de los errores refractivos residuales mediante el uso de grados de libertad no convencionales. Se centra, fundamentalmente, en la caracterización in vitro de una variedad de lentes comercialmente disponibles (monofocales, multifocales, esféricas, asféricas, apodizadas, no-apodizadas, y distintos materiales, potencias y adiciones) en un banco óptico. Para ello se han diseñado y puesto a punto los métodos de medida y un montaje experimental que reproduzca las condiciones en las que las lentes se implantan en el ojo de a...

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“…Polarized Red/Green filters (2) Images (1) Edge--based Colored random dots Disparity range 400--800 arcsec 15--480 and >480 arc--sec Table 5.1: Main characteristics of the stereoacuity tests used. (1) See figure 5.1.…”

Section: Dissociative Spectaclesmentioning

confidence: 99%

Caracterización óptica de lentes intraoculares = Optical characterization of intraocular lenses

Alba Bueno

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The optical characterization of an intraocular lens (IOL) provides objective and quantitative information that is essential to fully understand its performance as an implant that replaces the crystalline lens in the human visual system. Additionally, it can be used to predict the performance of the new IOL designs. This thesis analyses the main sources of uncertainty in the calculation of the IOL power and the compensation of the residual refractive errors by using some unconventional degrees of freedom. The thesis focuses on the in vitro characterization of a variety of commercially available IOLs (monofocal, multifocal, spherical, aspherical, apodized, full--aperture, and of different materials, powers and additions) in optical bench. To this end, we have designed and implemented the necessary methods of measurement and an experimental setup that, according to the international standard regulation, reproduces the conditions of such implants in the human eye. We have developed a method to measure the energy efficiency of IOLs. This method has allowed us to explain the clinical results obtained in the evaluation of the stereoscopic acuity when using two tests based on different principles. The optical imaging quality of IOLs has been quantified through the experimental measurement of the modulation transfer function and the fringe visibility (contrast). We have developed and implemented a method to characterize some artifact, named halo, that can be perceived by those patients implanted with multifocal IOLs. Finally, all the experimental results have been used as a basis for the comparison of the IOL performances. La caracterización óptica de las lentes intraoculares (IOLs del inglés Intraocular Lenses) proporciona una información objetiva y cuantitativa que es necesaria para comprender su funcionamiento como implante que sustituye al cristalino en el sistema visual humano. Además, permite predecir el rendimiento de los nuevos diseños. Dicha caracterización se debe llevar a cabo mediante pruebas in vivo en pacientes ya implantados así como con pruebas in vitro en banco óptico o mediante simulación teórica. Esta tesis analiza las fuentes de error en el cálculo de la potencia de las lentes intraoculares y la compensación de los errores refractivos residuales mediante el uso de grados de libertad no convencionales. Se centra, fundamentalmente, en la caracterización in vitro de una variedad de lentes comercialmente disponibles (monofocales, multifocales, esféricas, asféricas, apodizadas, no--apodizadas, y distintos materiales, potencias y adiciones) en un banco óptico. Para ello se ha diseñado y puesto a punto los métodos de medida, un montaje experimental que reproduzca las condiciones en las que las lentes se implantan en el ojo y de acuerdo con la normativa internacional. Se ha medido la calidad óptica a través de la Función de Transferencia de Modulación o la visibilidad de franjas (contraste). Se ha desarrollado e implementado un método para la cuantificación experimental de la eficiencia energética de los distintos modelos de IOLs. Este método ha servido para explicar algunos resultados clínicos obtenidos al evaluar la visión estereoscópica con dos tests con diferente principio de funcionamiento. Se ha desarrollado e implementado un método para caracterizar el halo que perciben algunos pacientes implantados con IOLs multifocales

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New trends in intraocular lens imaging

Cited by 4 publications

References 49 publications

Refractive Outcomes after Cataract Surgery

Refractive Outcomes after Cataract Surgery

Optical Characterization of Intraocular Lenses

Caracterización óptica de lentes intraoculares = Optical characterization of intraocular lenses

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