Anterior Segment Variations with Age and Accommodation Demonstrated by Slit-Lamp–Adapted Optical Coherence Tomography

Yan, Pisong; Lin, Haotian; Wang, Qilin; Zhang, Zhen-Pin

doi:10.1016/j.ophtha.2010.03.027

Cited by 50 publications

(50 citation statements)

References 23 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%

“…However, Yan et al (26) found greater changes than that observed in previous studies. The central ACD decreased by 0.25 ± 0.09 mm.…”

Section: Anterior Chamber Depthmentioning

confidence: 62%

“…Table 1 is a compilation of the results of all studies that evaluated at least one of these three eye metrics during accommodation. Studies assessing the changes in central ACD , mean ACA (16) , and PD (3,7,26,28,29) during accommodation concluded that these metrics decreased after increasing the stimulus vergence. Figure 1 The changes in the peripheral ACD and ACA at different meridians during accommodation have not been studied.…”

Section: Introductionmentioning

confidence: 99%

“…Such studies will enable the development of new anterior chamber IOLs that better fits the anterior chamber eye. Several studies have evaluated the changes in pupil diameter during accommodation (3,7,26,28,29) . However, four of these studies (3,7,26,28) included myopic or hyperopic subjects and mea-sured the changes in pupil diameter with stimuli vergences beyond 5 D. Further, a Scheimpflug system has not been used to study the changes in pupil that occur during accommodation.…”

Section: Introductionmentioning

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%

“…However, Yan et al (26) found greater changes than that observed in previous studies. The central ACD decreased by 0.25 ± 0.09 mm.…”

Section: Anterior Chamber Depthmentioning

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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“…With aging, the lens increases in thickness and moves forward. Accordingly, the lens thickness to axial length factor increases (Lim et al, 2006;Yan et al, 2010). Furthermore, to our best knowledge, almost all patients with angle-closure glaucoma secondary to iris cysts in previous case reports showed shallow anterior chambers on UBM images.…”

Section: Discussionmentioning

confidence: 68%

Effect of primary iris and ciliary body cyst on anterior chamber angle in patients with shallow anterior chamber

Wang

Yao

2012

J. Zhejiang Univ. Sci. B

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Abstract:Objective: To evaluate the prevalence of primary iris and/or ciliary body cysts in eyes with shallow anterior chamber and their effect on the narrowing of the anterior chamber angle. Methods: Among the general physical check-up population, subjects with shallow anterior chambers, as judged by van Herick technique, were recruited for further investigation. Ultrasound biomicroscope (UBM) was used to detect and measure the cysts located in the iris and/or ciliary body, the anterior chamber depth (ACD), the angle opening distance at 500 µm (AOD500), and the trabecular-iris angle (TIA). A-scan ultrasonography was used to measure the ocular biometry, including lens thickness, axial length, lens/axial length factor (LAF), and relative lens position (RLP). The effect of the cyst on narrowing the corresponding anterior chamber angle and the entire angle was evaluated by the UBM images, ocular biometry, and gonioscopic grading. The eye with unilateral cyst was compared with the eye without the cyst for further analysis. Results: Among the 727 subjects with shallow anterior chamber, primary iris and ciliary body cysts were detected in 250 (34.4%) patients; among them 96 (38.4%) patients showed unilateral single cyst, 21 (8.4%) patients had unilateral double cysts, and 42 (16.8%) patients manifested unilateral multiple and multi-quadrants cysts. Plateau iris configuration was found in 140 of 361 (38.8%) eyes with cysts. The mean size of total cysts was (0.6547±0.2319) mm. In evaluation of the effect of the cyst size and location on narrowing the corresponding angle to their position, the proportion of the cysts causing corresponding angle narrowing or closure among the cysts larger than 0.8 mm (113/121, 93.4%) was found to be significantly higher than that of the cysts smaller than 0.8 mm (373/801, 46.6%), and a significant higher proportion was also found in the cysts located at iridociliary sulcus (354/437, 81.0%) than in that at the pars plicata (131/484, 27.1%). In evaluating the effect of the cyst on the entire anterior chamber angle, the eyes with multiple and multi-quadrants cysts manifested significant narrowing of the entire anterior chamber angle as compared with the eyes without cysts, based on the data analysis in comparison of TIA, AOD500, and gonioscopic grading evaluation. The unilateral single or double cysts in the eyes had no significant effect on narrowing of anterior chamber angle as compared with eyes without cysts. The iris and/or ciliary body cysts did not seem to affect the axial length, ACD, lens thickness, RLP, LAF. Conclusions: The prevalence of primary iris and ciliary body cyst was 34.4% in the subjects with shallow anterior chamber. The cysts larger than 0.8 mm, locating at iridociliary sulcus, or multiple and extensive cysts were inclined to cause the angle narrowing or closure.

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Kann die implantierbare Collamer-Linse mit Aquaport eine Winkelblockproblematik sicher verhindern?

et al. 2015

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Anterior Segment Variations with Age and Accommodation Demonstrated by Slit-Lamp–Adapted Optical Coherence Tomography

Cited by 50 publications

References 23 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

Effect of primary iris and ciliary body cyst on anterior chamber angle in patients with shallow anterior chamber

Kann die implantierbare Collamer-Linse mit Aquaport eine Winkelblockproblematik sicher verhindern?

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