Spherical Aberration and Depth of Focus in Eyes Implanted with Aspheric and Spherical Intraocular Lenses

Rocha, Karolinne Maia; Soriano, Eduardo; Chamon, Wallace; Chalita, Maria Regina; Nosé, Walton

doi:10.1016/j.ophtha.2007.01.024

Cited by 121 publications

(64 citation statements)

References 22 publications

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“…In a contralateral eye study, we found that residual spherical aberration can enhance the depth of focus and the tolerance to defocus seemed to be higher in eyes implanted with spherical IOLs than in aspheric IOLs. 4 The simulation of positive or negative spherical aberration can have the effect of enhancing the depth of focus with linear shifting of the center of focus by 2.60 diopters (D) per millimeter of error. 5 This increase in depth of focus can reach up to 2.00 D with 0.6 µm of spherical aberration and is reduced when the aberration is increased to 0.9 µm.…”

Section: Edf Using Spherical Aberration Designmentioning

confidence: 99%

Extended Depth of Focus IOLs: The Next Chapter in Refractive Technology?

Rocha¹

2017

J Refract Surg

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Section: Edf Using Spherical Aberration Designmentioning

confidence: 99%

Extended Depth of Focus IOLs: The Next Chapter in Refractive Technology?

Rocha¹

2017

J Refract Surg

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“…55 A reduction in the depth of focus that can result from asphericity is an important consideration as most patients undergoing cataract surgery are presbyopic. 56 In a postal survey of ophthalmologists in New Zealand in 2007, 27 per cent of surgeons who responded claimed to use aspheric IOLs routinely. …”

Section: Aspheric Lensesmentioning

confidence: 99%

Advances in cataract surgery

Ashwin

Shah

Wolffsohn

2009

Clinical and Experimental Optometry

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Cataract surgery is a technique described since recorded history, yet it has greatly evolved only in the latter half of the past century. The development of the intraocular lens and phacoemulsification as a technique for cataract removal could be considered as the two most significant strides that have been made in this surgical field. This review takes a comprehensive look at all aspects of cataract surgery, starting from patient selection through the process of consent, anaesthesia, biometry, lens power calculation, refractive targeting, phacoemulsification, choice of intraocular lens and management of complications, such as posterior capsular opacification, as well as future developments. As the most common ophthalmic surgery and with the expanding range of intraocular lens options, optometrists have an important and growing role in managing patients with cataract.

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“…11 The contribution of spherical aberration (SA) to the enhancement of presbyopic vision and post-cataract (IOL) surgery has been a topic of interest and debate among the vision scientists in the recent past. 5,7,10,[12][13][14][15][16][17] Although most agree that the multifocal effect of low-level SA increases the eye's depth of focus and leads to pseudo-accommodation, 5,7,8,10,13,17 there are a few others who also demonstrated an improvement in the subjects' spatial vision at the bestfocus position without compromising the subjective tolerance to defocus, despite a complete correction of the ocular SA. 12,15,16 These contradictory findings leave the clinicians and surgeons doubtful, whether or not to leave the patient with the residual amounts of SA for the benefit of DoF.…”

Section: Introductionmentioning

confidence: 99%

“…Some researchers proposed and proved that the inherent blur induced by positive SA would leave the patient less susceptible to the effects of defocus and chromatic aberrations. 5,7,10,17 The patent issued to Somani and Yee 18 claims that negative SA provides significantly larger DoF than a positive SA of the same magnitude, which would be sufficient to mitigate presbyopic symptoms. However, there has been no additional evidence supporting this position.…”

Section: Introductionmentioning

confidence: 99%

Depth-of-Focus and its Association with the Spherical Aberration Sign. A Ray-Tracing Analysis

Bakaraju

Ehrmann

Papas

et al. 2010

Journal of Optometry

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PURPOSE: To investigate the relationship between the sign of spherical aberration (SA) and the corresponding depth-of-focus (DoF) values around best focus, at three different spatial frequencies (SF). Additionally, to study the influence of the Stiles-Crawford effect (SCE) on DoF. METHODS: We modeled schematic eyes having a range of SA values, C (4, 0), from -0.20 to 0.20 μm, at 6 mm pupil, in a ray-tracing software (Zemax). The through-focus optical performance was obtained via Modulation Transfer Function (MTF) calculations using thin paraxial lenses in-front of the model eye, from -2.00 to+2.00 D in 0.05D steps. Through-focus full-width (defocus) occurring at the half maximum of MTF value was considered as DoF, in diopters. RESULTS: For the low-SF configuration, +SA and -SA results were close to being mirror symmetries of one another. However, for midand high-SF targets, in the SA range spanning from -0.15 to 0.15 μm, models of equal SA magnitude but opposite sign produced similar DoF measures, but those with SA more negative than -0.15 μm showed marginally higher DoF than their positive counterparts. The SCE improved DoF for low SF (10 cycles/mm), while for mid and higher SF (>30 cycles/mm) mixed results were observed. CONCLUSIONS: As regards presbyopic-correction strategies that use deliberately induced aberrations to increase the depth of focus, the current study suggests that both positive and negative SA have equal potential. However, practical considerations will probably limit the useful DoF achievable through the utilization of SCE in presbyopes. for reference to a contemporary record detailing refractive history. RESUMEN OBJETIVO:Investigar, para tres frecuencias espaciales (FE) distintas, la relación entre el signo de la aberración esférica (AE) y la correspondiente profundidad de foco (PdF) alrededor del mejor foco. Además, se estudiará cómo afecta el efecto Stiles-Crawford (ESC) a la PdF. MÉTODOS: Hemos utilizado un modelo de ojo esquemático con distintos valores de aberración esférica (AE) (C (4, 0) comprendido entre 0.20 y 0.20 μm, para un diámetro de pupila de 6 mm) para investigar la relación que existe entre el signo de la AE y la correspondiente profundidad de foco (PdF) alrededor del mejor foco para tres frecuencias espaciales (FE) distintas. También se estudió la influencia del efecto Stiles-Crawford (ESC). RESULTADOS: Para FE bajas, los resultados correspondientes a +AE y AE presentan simetría especular. Sin embargo, para FE medias y altas, y en el intervalo de AE comprendido entre 0.15 y 0.15 μm, modelos de igual AE (en módulo) pero distinto signo da lugar a valores de PdF similares, pero para valores de AE más negativos que 0.15 μm se obtuvieron PdF ligeramente más altas que para un valor positivo equivalente de AE. El ESC hace que aumente la PdF para FE bajas (10 ciclos/mm), mientras que para FE medias y altas (>30 ciclos/mm) se observan resultados variados. CONCLUSIONES: En lo que respecta a las estrategias de corrección de la presbicia basadas en la inducción deliberada de ...

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Spherical Aberration and Depth of Focus in Eyes Implanted with Aspheric and Spherical Intraocular Lenses

Cited by 121 publications

References 22 publications

Extended Depth of Focus IOLs: The Next Chapter in Refractive Technology?

Extended Depth of Focus IOLs: The Next Chapter in Refractive Technology?

Advances in cataract surgery

Depth-of-Focus and its Association with the Spherical Aberration Sign. A Ray-Tracing Analysis

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