Anterior segment changes with age and during accommodation measured with partial coherence interferometry

Tsorbatzoglou, Alexis; Németh, Gábor; Széll, Noémi; Bíró, Zsolt; Berta, András

doi:10.1016/j.jcrs.2007.05.021

Cited by 46 publications

(50 citation statements)

References 25 publications

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“…A number of studies (Table 1) have assessed the changes in central ACD during accommodation. Our results are in agreement with those found previously in emmetropic volunteers (4,15,17,18,22,23,25,26) . Bolz et al (4) , who used partial coherence interferometry, found a relative ACD decrease of 4.92% after -4.00 D of vergence.…”

Section: Anterior Chamber Depthsupporting

confidence: 93%

“…The ACD obtained after -6 D accommodation was 5% shallower than that measured for far vision. Malyugin et al (17) , Read et al (23) , and Tsorbatzoglou et al (25) studied changes in ACD after -3.00 D of accommodation and found that the relative changes were 3.80%, 3.20% and 2.23%, respectively. Finally, Ni et al (18) and Read et al (22) also studied the changes in ACD with accommodation in young eyes with the help of Pentacam HR.…”

Section: Anterior Chamber Depthmentioning

confidence: 99%

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Changes in anterior chamber eye during accommodation as assessed using a Dual Scheimpflug system

Domínguez‐Vicent¹,

Monsálvez-Romín²,

Albarrán-Diego³

et al. 2014

Arquivos Brasileiros De Oftalmologia

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Purpose: To study the changes in anterior chamber depth (ACD), anterior chamber angle (ACA), and pupil diameter (PD) during accommodation. Methods: Eighty eyes of 80 subjects, aged 22 to 40 years, were included. The rotating Dual Scheimpflug and a Placido disc system (Galilei G4, Ziemer Ophthalmic Systems AG, Switzerland) was used to measure the changes in ACD, ACA, and PD during accommodation. ACD measurement was taken for the central zone and for 4 more positions, each in different orientation (nasal, superior, temporal and inferior), 4 mm away from the centre. ACA was measured for the whole eye as well for the nasal, superior, temporal, and inferior quadrants. These metrics were obtained for various accommodation stimuli, ranging from +1 D to -4 D in 1-D steps. Results: For a given position, the ACD did not vary significantly with accommodation. For the central ACD, the percentage of relative change between far and near vision was -4.11%. The ACA was significantly lower at the inferior, temporal, and superior positions. There was no change in the ACA of the whole eye and that of the nasal orientation. These two eye metrics were significantly lower in the superior-nasal than in the inferior-temporal region. At each vergence studied, the PD decreased significantly with accommodation. The relative change after the -4 D stimulus was -8.13%. Conclusion: ACA and PD varied significantly with accommodation, whereas no such variation of ACD was observed. Further, the anterior chamber was found to be asymmetrical, with the nasal-superior area becoming significantly shallower than the inferior temporal region. Keywords

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Section: Anterior Chamber Depthsupporting

confidence: 93%

Section: Anterior Chamber Depthmentioning

confidence: 99%

Changes in anterior chamber eye during accommodation as assessed using a Dual Scheimpflug system

Domínguez‐Vicent¹,

Monsálvez-Romín²,

Albarrán-Diego³

et al. 2014

Arquivos Brasileiros De Oftalmologia

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“…We demonstrated that beside the age-related material and geometric properties, the effect of the refractive index of the lens is also important (Figure 15). If we compare our numerical results with values measured by Tsorbatzoglou et al (2007) [21] based on defocusing technique, we obtain the following diagram (see also Figure 15). Subjects were divided into 3 age groups: younger than 30 years (Group 1), between 31 years and 44 years (Group 2), and older than 45 years (Group 3).…”

Section: Discussionmentioning

confidence: 85%

“…These applied data are mostly based on literature values. Finally, the calculated values will be compared to measurement results of Tsorbatzoglou et al (2007). [21] 2 Materials and methods Numerical simulations are carried out with the ANSYS Mechanical APDL code.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, the calculated values will be compared to measurement results of Tsorbatzoglou et al (2007). [21] 2 Materials and methods Numerical simulations are carried out with the ANSYS Mechanical APDL code. Our three-dimensional complex continuum model contains the following anatomical parts of the eye: sclera, cornea, ciliary body, the lens with its three parts (lens nucleus, lens cortex and capsule), aqueous humour, vitreous body, zonular fibres and the supporting fat tissue (see Figure 4).…”

Section: Introductionmentioning

confidence: 99%

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Biomechanical modelling of the accommodation problem of human eye

Bocskai

Bojtár

2013

Per. Pol. Civil Eng.

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IntroductionThe eye is one of the most important sensory organs of the human body. The human eye is an almost spherical elastic organ with spatial elastic support. The properties of its components are always considerably age-related. There are several studies and numerical investigations which dealt with these subjects: Abolmaali et al. (2007) [1], Burd et al. (2002) [7] and Liu et al. (2006) [16]. The biomechanical model of a human eye consists of two basic systems: cornea-sclera with the ciliary muscle and crystalline lens. Each of the two systems is modelled separately due to their different purposes, but the complex modelling of the human eye is rare, despite of the fact that the surrounding parts can influence the results, such as the elastic bearing with the fatty tissue.We have built a complex three dimensional finite element model which contains the biologically and mechanically required parts for biomechanical analysis that we want to analyse.In this paper we do not use all the advantages of the complexity of our model, we only want to show one field that we can analyze with it. But we emphasize that it is unequivocal that if we want to analyze, for instance, the movement of nonsymmetric intraocular lens implantation or effects of blunt eye injuries, the 3D model is already indispensable.We have examined in this paper the accommodation problem based on the classical Helmholtz theory according to the age-related changes in geometry and materials. We note that there are several controversial other theories for accommodation (Schachar, Coleman, etc.), but based on the doctors' opinion from Semmelweis University, Department of Ophthalmology and other specialists (Burd et al.) [7] we accept the classical Helmholtz theory and we do not wish to go into the possibilities of applying different theories and debates. We describe the essence of Helmholtz theory later.To understand the problem, we have to discuss very shortly what the accommodation of the human eye is. To answer this question we have to look over the main parts of the eye: these are the sclera, the cornea, the ciliary muscle, the zonular fibres and the crystalline lens with nucleus, cortex and capsule (see Figure 1).

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Pseudo-accommodation in non-amblyopic children after bilateral cataract surgery and implantation with a monofocal intraocular lens: prevalence and possible mechanisms

Dénier

Dureau

Edelson

et al. 2016

Graefes Arch Clin Exp Ophthalmol

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Anterior segment changes with age and during accommodation measured with partial coherence interferometry

Cited by 46 publications

References 25 publications

Changes in anterior chamber eye during accommodation as assessed using a Dual Scheimpflug system

Changes in anterior chamber eye during accommodation as assessed using a Dual Scheimpflug system

Biomechanical modelling of the accommodation problem of human eye

Pseudo-accommodation in non-amblyopic children after bilateral cataract surgery and implantation with a monofocal intraocular lens: prevalence and possible mechanisms

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