Apparent accommodation and depth of field in pseudophakia

Elder, Mark; Murphy, Conor C; Sanderson, Gordon

doi:10.1016/s0886-3350(96)80020-4

Cited by 60 publications

(39 citation statements)

References 14 publications

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“…This is also true for the aphakic eye and is generally referred to as apparent accommodation, or pseudoaccommodation. Pseudoaccommodation with monofocal IOL ranges between 0.7 to 5.1 D depending on the method of assessment used, with a mean amount of about 2 D [7,13,23,55,67,81].…”

Section: What Is True Accommodation?mentioning

confidence: 99%

Accommodating intraocular lenses: a critical review of present and future concepts

Menapace

Findl

Kriechbaum

et al. 2006

Graefe's Arch Clin Exp Ophthalmol

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As opposed to psychophysical evaluation techniques, laser interferometry measures what shift lenses are designed to provide: axial shift on accommodative effort. While under pilocarpine some movement was recorded, no movement at all was found under near-point stimulation with any of the lenses currently marketed. In contrast, magnetic-driven active-shift lens systems carry the potential of sufficiently topping up apparent accommodation to provide for clinically useful accommodation while using conventional lens designs with proven after-cataract performance. Dual optic implants significantly increase the impact of axial optic shift. The main potential problem, however, is delayed formation of interlenticular regenerates. Lens refilling procedures offer the potential of fully restoring accommodation due to the great impact of increase in surface curvature on refractive lens power. However, various problems remain to be solved before clinical use can be envisaged, above all, again, after-cataract prevention. The concept of passive single-optic shift lenses has failed. Concomitant poor capsular bag performance makes these lenses an unacceptable trade-off. Magnet-assisted systems potentially combine clinically useful accommodation with satisfactory after-cataract performance. Dual optic lenses theoretically offer substantial accommodative potential but may allow for interlenticular after-cataract formation. Lens refilling procedures have the greatest potential for fully restoring natural accommodation, but will again require years of extensive laboratory and animal investigations before they may function in the human eye.

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Section: What Is True Accommodation?mentioning

confidence: 99%

Accommodating intraocular lenses: a critical review of present and future concepts

Menapace

Findl

Kriechbaum

et al. 2006

Graefe's Arch Clin Exp Ophthalmol

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“…14 The amplitude of apparent accommodation varies significantly from patient to patient. Previous studies confirmed that the amplitude of apparent accommodation is correlated with depth of focus, 15,16 pupil diameter, [17][18][19][20] and degree of corneal astigmatism. [21][22][23][24][25] There are many studies about the forward movement of various types of IOLs during accommodation effort.…”

Section: Discussionmentioning

confidence: 55%

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

Németh

Tsorbatzoglou

Vámosi³

et al. 2006

Eye

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“…So it depends on patient cooperation and understanding. Subjective methods were found to be more reliable for measuring apparent accommodation according to Langenbucher et al 16 Many previous researches confirmed that the amplitude of apparent accommodation is correlated with different factors including; depth of focus 17,18 , pupil diameter 4,19 , degree of corneal astigmatism 20 , corneal multifocality and aberrations 21,22 , and IOL axial forward movement. 23,24 Depth of focus is an intrinsic characteristic of all optical systems that was considered to be one of the most significant factors of apparent accommodation.…”

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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Apparent accommodation and depth of field in pseudophakia

Abstract: In the absence of astigmatism and disease, a pseudophakic eye with -0.75 D of myopia can expect to achieve 20/30 uncorrected distance acuity and read N5 unaided if the pupil is approximately 2.5 mm.

Cited by 60 publications

References 14 publications

Accommodating intraocular lenses: a critical review of present and future concepts

Accommodating intraocular lenses: a critical review of present and future concepts

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

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

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