Computer-animated model of accommodation and presbyopia

Goldberg, Daniel B.

doi:10.1016/j.jcrs.2014.07.028

Cited by 20 publications

(12 citation statements)

References 25 publications

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“…The adult annular ligament is 8-9 mm in diameter and 1-2 mm thick [5]. The ligament was thought to be a vestigial remnant of the regressing fetal hyaloid vasculature, but this has been disputed and more recently computer models of the accommodation process have suggested that it may assist in shaping the posterior curvature of the lens [6,7]. …”

Section: Introductionmentioning

confidence: 99%

Real-Time Intraoperative Optical Coherence Tomography Imaging Confirms Older Concepts About the Berger Space

Tassignon

Dhubhghaill²

2016

Ophthalmic Res

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Background: The presence of a space between the posterior capsule and the anterior vitreous was first reported in 1887, but difficulties inherent in examining this structure made it impossible to visualize this area in vivo until now. Estimation of the size of this space was considered to be impossible. Materials and Methods: We utilized an optical coherence tomography (OCT) system attached to the Zeiss Opmi Lumera 700/Rescan microscope (Zeiss Ltd., Jena, Germany) to provide real-time images of the Berger space, the anterior hyaloid and the ligament of Wieger. Results: Imaging in 3 patients provided beautiful, real-time OCT images of the Berger space and of the ligament of Wieger. In one highly myopic eye, there was even evidence of anterior vitreous detachment. Conclusion: Previously unseen transparent structures of the eye can now be imaged intraoperatively using real-time OCT. This new technology seems very promising in achieving a better understanding of the anterior vitreous interface, more specifically of the anterior hyaloid and its posterior capsule attachment by the ligament of Wieger. Changes in the anterior hyaloid and its capsular attachment may contribute to a better understanding of the posterior segment complications after cataract surgery.

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Section: Introductionmentioning

confidence: 99%

Real-Time Intraoperative Optical Coherence Tomography Imaging Confirms Older Concepts About the Berger Space

Tassignon

Dhubhghaill²

2016

Ophthalmic Res

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“…9 , 18 This may impact the age-related biomechanical and neuromuscular changes of the eye to reverse the loss of accommodation in presbyopes. 22 In this brief report, the DCNVA for all patients remained at 20/20 or better up to 13 years postoperatively. This suggests that LaserACE can enhance the accommodative ability of presbyopes.…”

Section: Discussionmentioning

confidence: 78%

Long-term visual outcomes of laser anterior ciliary excision

Hipsley¹,

Hall²,

Rocha

2018

American Journal of Ophthalmology Case Reports

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PurposeTo determine the long-term visual outcomes of six eyes of 3 patients up to 13 years following the Laser Anterior Ciliary Excision (LaserACE) procedure.MethodsThree male patients of ages 59, 59, and 60 presented for evaluation at Storm Eye Institute, Medical University of South Carolina at 8, 10, and 13 years after the LaserACE procedure for presbyopia, respectively. All 3 patients had a history of laser vision correction (LVC) prior to LaserACE treatment. Visual performance was evaluated using ray-tracing aberrometry, specifically higher-order aberrations, visual Strehl of the optical transfer function (VSOTF), depth of focus (DoF), and effective range of focus (EROF). VSOTF was computed as a function of defocus using a through-focus curve. Subjective DoF was overlaid on the VSOTF through-focus curve to establish the best image quality metric threshold value for correlation between subjective and objective DoF. EROF was determined by measuring the difference in diopters between the near and distance DoF curves, at 50% of VSOTF.ResultsDistance-corrected visual acuity, distance-corrected intermediate visual acuity, and distance-corrected near visual acuity for all patients remained at 20/20 or better up to 13 years postoperatively. EROF averaged 1.56 ± 0.36 (D) for all eyes.Conclusions and ImportanceLaserACE provided improvement in near vision functionality in these LVC patients with long-term stability. The LaserACE procedure is not on the visual axis, therefore these patients could still receive correction to their hyperopic regression.

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“…On the basis of these experiments, fi nite element models were considered for calculating the shape of the lens and the functioning of the accommodation mechanism [15][16][17][18][19][20][21][22].…”

Section: Discussionmentioning

confidence: 99%

Theory: Morphological and functional features of the structure of the Zonula Lens Fibers as a key executive link in the mechanism of the human eye accommodation

Koshits¹,

Svetlova²,

Egemberdiev³

et al. 2020

J Clin Res Ophthalmol

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Purpose: Assess morphophysiological and functional features of the structure of the zonula lens fi bers on the basis of an in-depth analysis consistent with the laws of mechanics. Defi ne the purpose and scope of each portion of the zonula lens fi bers. To analyze the results of the research of studies on the structure of the zonula of Zinn in the different authors of the last two centuries. Identify misconceptions about the work of this executive mechanism of accommodation in different phases of accommodation, this includes the uneven accommodation in different meridians. Determine the incorrectness of those theories of accommodation, which are based on erroneous ideas about the functioning of different portions of the zonula fi bers.Methods: Theoretical analysis based on the laws of mechanics and assessment of the results of interdisciplinary research by different authors in the fi eld of structural and functional features of the Zinn's zonule of the lens in different phases of accommodation.Results: The lens's ciliary belt has been found to have three major portions of fi ber that perform different functions. Powerful anterior portion of fi bers is attached to the anterior surface of the lens bag in a segmented mannered a powerful posterior portion of fi bers is attached to the posterior surface of the lens evenly around the circumference and like a cobweb covering the surface of the vitreous chamber. Both these fi laments in the eye don't cross and in all phases of accommodation remain

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Computer-animated model of accommodation and presbyopia

Abstract: Dr. Goldberg is a consultant to Acevision, Inc., and Bausch & Lomb.

Cited by 20 publications

References 25 publications

Real-Time Intraoperative Optical Coherence Tomography Imaging Confirms Older Concepts About the Berger Space

Real-Time Intraoperative Optical Coherence Tomography Imaging Confirms Older Concepts About the Berger Space

Long-term visual outcomes of laser anterior ciliary excision

Theory: Morphological and functional features of the structure of the Zonula Lens Fibers as a key executive link in the mechanism of the human eye accommodation

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