A comparison of accommodation amplitudes in pseudophakic eyes measured with three different methods

Németh, Gábor; Tsorbatzoglou, Alexis; Vámosi, Péter; Sohajda, Zoltán; Berta, András

doi:10.1038/sj.eye.6702519

Cited by 14 publications

(8 citation statements)

References 31 publications

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“…Ray tracing aberrometry has also been utilized for the objective measurement of accommodation, having as a limitation the difficulty to evaluate aberrations in constricted pupils. Due to the high disparity of the methods that are used there is significant inconsistency in the results of many studies [8, 9]. Another source of inconsistency is the fact that several studies in order to evaluate accommodative response of the IOLs use pharmacologic stimulation of accommodation with pilocarpine, or pharmacologic relaxation with cyclopentolate, or both in different time points.…”

Section: Measurement Of Apparent Accommodationmentioning

confidence: 99%

Real and Pseudoaccommodation in Accommodative Lenses

Pallikaris

Kontadakis

Portaliou

2011

Journal of Ophthalmology

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In the attempt to manage presbyopia, different intraocular lens designs have been proposed such as monofocal IOLs with monovision or multifocal IOLs. Even though the lenses mentioned offer satisfactory visual results, contemporary ophthalmology has not completely answered the presbyopic dilemma by simulating the accommodative properties of the crystalline lens itself. Accommodative IOLs were designed to fill this gap and provide satisfactory vision for all distances by restoring some degree of “pseudoaccommodation.” Pseudo accommodative capability can be linked to monofocal IOL's as well but the results are not satisfactory enough to fully support unaided near vision. Pseudoaccommodation is a complex phenomenon that can be attributed to several static (i.e., pupil size, against-the-rule cylindrical refractive error, multifocality of the cornea) and dynamic (i.e., anterior movement of the implant itself) factors. Objective measurement of the accommodative capability offered by the accommodative IOLs is extremely difficult to obtain, and different methods such as autorefractometers, retinoscopy, and ultrasound imaging during accommodative effort, ray tracing, or pharmacological stimulation have been developed but the results are sometimes inconsistent. Despite the difficulties in measuring accommodation, accommodative IOLs represent the future in the attempt to successfully “cure” presbyopia.

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Section: Measurement Of Apparent Accommodationmentioning

confidence: 99%

Real and Pseudoaccommodation in Accommodative Lenses

Pallikaris

Kontadakis

Portaliou

2011

Journal of Ophthalmology

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“…There were no significant changes of corneal curvature measurements by pentacam preoperatively and over the 6 months postoperatively. 15 who used minus-lenses-to-blur reporting a mean of 0.83±0.63D.…”

Section: Discussionmentioning

confidence: 99%

The Analysis of Refraction and Accommodation of Extreme Myopia with Cataract after Phacoemulsification and IOL Implantation

Al-Wesabi¹,

Yang²,

Li³

et al. 2016

IOSR

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Abstract:Background: To assess the refractive status of cataract patients with extreme myopia and to measure their accommodative capability after monofocal IOL implantation. Design: Prospective non-randomized study conducted at Tianjin Medical University Eye Centre.Participants: 18 patients with 34 extreme myopic eyes ≥27mm axial length), and 14 patients with 27 non-myopic eyes that had uneventful phacoemulsification and monofocal IOL implantation. Methods:The accommodation amplitude of the two groups was compared pre-and post-operatively using subjective minus-lenses-to-blur method. In the extreme myopic group, the postoperative target refraction was selected to be myopic, and they were evaluated for predicted postoperative spherical power consistency.

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“…One attempt was the change in anterior chamber depth (ACD) following application of pilocarpine-simulating accommodation. [7][8][9][10][11][12] However, the subjective measurement of changing distances in the eye and the subsequent calculation of dynamic course changes in diopters remains difficult with these methods. [9][10][11][12] A new method to measure accommodation takes aberration measurements during the process of accommodation.…”

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confidence: 99%

Dynamic stimulation of accommodation

Ehmer

Mannsfeld

Auffarth

et al. 2008

Journal of Cataract and Refractive Surgery

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We describe the analysis of accommodation using wavefront measurements in phakic and pseudophakic eyes. Accommodation measurements were performed in phakic and pseudophakic eyes using a dynamic stimulation aberrometry (DSA) device (Optana) as an attachment to the WASCA aberrometer (Carl Zeiss Meditec AG). Aberrations were measured for distance fixation (3.0 m) and near fixation (0.3 to 0.11 m) presenting different accommodative stimuli (3.0 to 9.0 diopters). The device was able to detect changes in aberrations using near and distance stimulation. Eyes with phakic iris-fixated intraocular lenses (IOLs) showed normal age-correlated accommodation. In pseudophakic eyes, accommodation varied depending on the IOL. With monofocal IOLs (eg, MA60AC, Alcon), there was no accommodation; with an accommodating IOL (eg, Synchrony, Visiogen), there was a low level of accommodation. The DSA device is capable of measuring accommodation using wavefront data. It will help to further analyze changes in accommodation-related wavefront aberrations.

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A comparison of accommodation amplitudes in pseudophakic eyes measured with three different methods

Abstract: Purpose To compare the accommodative amplitudes with three different methods in pseudophakic eyes with different types of intraocular lenses (IOLs

Cited by 14 publications

References 31 publications

Real and Pseudoaccommodation in Accommodative Lenses

Real and Pseudoaccommodation in Accommodative Lenses

The Analysis of Refraction and Accommodation of Extreme Myopia with Cataract after Phacoemulsification and IOL Implantation

Dynamic stimulation of accommodation

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