Ocular anatomic changes for different accommodative demands using swept-source optical coherence tomography: a pilot study

Esteve-Taboada, José J.; Ferrer-Blasco, Teresa; Aloy, M. Á.; Adsuara, José E.; Cerdá–Durán, P.; Mimica, P.; Montés‐Micó, Robert

doi:10.1007/s00417-017-3801-z

Cited by 12 publications

(5 citation statements)

References 26 publications

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“…The classic theory of Helmholtz and Fincham indicates that, during accommodation, the anterior surface of the lens becomes steeper and moves forward (increasing its thickness), causing a decrease of the ACD 33 . In recent studies, LT and ACD changes were compared in near and far fixation conditions by IOL Master 700 34, 35. Mean LT was increased and ACD was decreased under near fixated condition as coherent with the classical theory.…”

Section: Discussionmentioning

confidence: 58%

The acute effects of single cup of coffee on ocular biometric parameters in healthy subjects

Uzun

Aslan

Öter

et al. 2019

Journal of Current Ophthalmology

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PurposeTo evaluate ocular biometric changes in healthy subjects after caffeine consumption from a cup of coffee.MethodsA total of 36 subjects were included in this prospective observational study. Axial length (AL) and anterior segment parameters including aqueous depth (AD), anterior chamber depth (ACD), lens thickness (LT), and central corneal thickness (CCT) were measured with optic biometry, Lenstar LS 900 (Haag-Streit, Inc., Koeniz, Switzerland) before and 1 and 4 h after ingesting a cup of coffee (60 mg caffeine/100 mL).ResultsMean age of the participants was 30.05 ± 7.43 years (range, 19–45). At baseline, 1st, and 4th hour, AL values were 23.9 ± 1.04 mm, 23.91 ± 1.04 mm, and 23.89 ± 1.04 mm, respectively, and no significant difference was observed (P>0.05). At baseline, 1st, and 4th hour, AD values were 3.06 ± 0.3 mm, 3.11 ± 0.3 mm, and 3.09 ± 0.3 mm, and ACD values were 3.6 ± 0.32, 3.66 ± 0.31, and 3.64 ± 0.31, respectively. AD and ACD values were significantly greater than baseline at 1st and 4th hours following coffee ingestion. Coffee intake caused a significant reduction in LT, compared with baseline and at the 1st and 4th hours which were 3.76 ± 0.28 mm, 3.69 ± 0.32 mm, and 3.72 ± 0.27 mm, respectively. No statistically significant difference was determined in between the 3 measurements in terms of CCT (P>0.05).ConclusionCaffeine causes a significant increase in AD and ACD and a significant decrease in LT following oral intake, for at least 4 h.

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Section: Discussionmentioning

confidence: 58%

The acute effects of single cup of coffee on ocular biometric parameters in healthy subjects

Uzun

Aslan

Öter

et al. 2019

Journal of Current Ophthalmology

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“…Contraction of the ciliary muscle during accommodation causes a centripetal (inwards, towards the centre of the eye) and anterior (towards the cornea) movement of ciliary muscle mass (Esteve-Taboada et al, 2017;Sheppard and Davies, 2010;Tamm et al, 1992). The longitudinal fibres are responsible for the anterior shift in muscle mass during contraction, whereas the radial and circular fibres are responsible for the inward movement of muscle mass during contraction, with the circular fibres acting as a sphincter (Pardue and Sivak, 2000), whilst the contractile response is thought to be greater temporally than nasally, possibly in order to align the lenticular axes during convergence (Sheppard and Davies, 2010).…”

Section: Ciliary Musclementioning

confidence: 99%

Presbyopia: Effectiveness of correction strategies

Wolffsohn

Davies

2019

Progress in Retinal and Eye Research

214

178

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Presbyopia is a global problem affecting over a billion people worldwide. The prevalence of unmanaged presbyopia is as high as 50% of those over 50 years of age in developing world populations, due to a lack of awareness and accessibility to affordable treatment, and is even as high as 34% in developed countries. Definitions of presbyopia are inconsistent and varied, so we propose a redefinition that states "presbyopia occurs when the physiologically normal age-related reduction in the eye's focusing range reaches a point, when optimally corrected for distance vision, that the clarity of vision at near is insufficient to satisfy an individual's requirements". Strategies for correcting presbyopia include separate optical devices located in front of the visual system (reading glasses) or a change in the direction of gaze to view through optical zones of different optical powers (bifocal, trifocal or progressive addition spectacle lenses), monovision (with contact lenses, intraocular lenses, laser refractive surgery and corneal collagen shrinkage), simultaneous images (with contact lenses, intraocular lenses and corneal inlays), pinhole depth of focus expansion (with intraocular lenses, corneal inlays and pharmaceuticals), crystalline lens softening (with lasers or pharmaceuticals) or restored dynamics (with 'accommodating' intraocular lenses, scleral expansion techniques and ciliary muscle electrostimulation); these strategies may be applied differently to the two eyes to optimise the range of clear focus for an individual's task requirements and minimise adverse visual effects. However, none fully overcome presbyopia in all patients. While the restoration of natural accommodation or an equivalent remains elusive, guidance is given on presbyopic correction evaluation techniques.

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Section: Discussionmentioning

confidence: 99%

“…One explanation was due to the continuous development of the new lens fibers in the equatorial region of the lens [15,16]. Additionally, the ciliary body becomes relaxed to the curvature enlargement of the lens with aging, which will also cause an increase in LT [17][18][19]. There was still no consensus with aspect to the association between gender and LT. Jonas' results showed that the LT was significantly associated with the male gender in a multivariate analysis [7].…”

Section: Discussionmentioning

confidence: 99%

Lens Thickness and Its Association with General and Ocular Parameters in Healthy Subjects

Cao¹,

Liao²,

He³

et al. 2022

Preprint

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The crystalline lens lens thickness playing an essential role in maintaining normal visual function, but little attention is paid to the lens thickness. The purpose of this study is to document the normative values of lens thickness (LT) in healthy subjects of Southern China and to evaluate its associated factors. This was a prospective, clinic-based, observational, cross-sectional study. A total of 526 eyes from 263 healthy subjects aged between 5-84 years (mean age, 38.48 ± 22.04 years ) were included in the study. All subjects underwent detailed ophthalmic examination, including the measurement of ocular biometric parameters by LenStar LS900. The study focused on LT and its association with general and ocular factors. The generalized estimation equation (GEE) model was used for statistical analysis. The Mean LT was 4.01 ± 0.57 mm(95% CI, 3.97 - 4.06; median, 3.94 mm; range, 3.10 - 5.36). In a univariate regression analysis, the LT was associated significantly age, body weight, body height, body mass index (BMI), systolic pressure, diastolic pressure, spherical equivalent (SE), intraocular pressure (IOP), anterior chamber depth (ACD) and axial length (AL) (all P <0.05 ). After adjusting the general parameters and ocular parameters, LT was associated significantly with age (β, 0.0151; 95% CI, 0.0116 - 0.0186; P <0.001), gender (β, 0.1233; 95% CI, 0.0553 - 0.1913; P <0.001) and ACD (β, -0.5815; 95% CI, -0.8059 - -0.3571; P <0.001) using the multivariate regression model.The LT was associated with older age, female gender, and shallower ACD in healthy subjects from Southern China. The data may help understand ocular diseases concerning lens thickness.

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Ocular anatomic changes for different accommodative demands using swept-source optical coherence tomography: a pilot study

Abstract: A practical methodology to assess the changes in ocular parameters for different accommodative demands using the IOLMaster 700 based on SS-OCT has been described. Statistically significant changes that have been found that agree well with previous reports.

Cited by 12 publications

References 26 publications

The acute effects of single cup of coffee on ocular biometric parameters in healthy subjects

The acute effects of single cup of coffee on ocular biometric parameters in healthy subjects

Presbyopia: Effectiveness of correction strategies

Lens Thickness and Its Association with General and Ocular Parameters in Healthy Subjects

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