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

Domínguez‐Vicent, Alberto; Monsálvez-Romín, Daniel; Albarrán-Diego, César; Sanchis-Jurado, Vicent; Montés‐Micó, Robert

doi:10.5935/0004-2749.20140062

Cited by 9 publications

(4 citation statements)

References 16 publications

(38 reference statements)

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“…However, temporal ACA, inferior ACA, trabecular ciliary process distance and anterior chamber depth (ACD) were not affected. In Dominiguez-Vicent et al study [ 25 ], they found no significant ACD change during accommodation using Dual Scheimpflug and a Placido disc. However, the ACA, at the superior, temporal and inferior positions, varied significantly during accommodation.…”

Section: Discussionmentioning

confidence: 97%

Ultrasound biomicroscopy study of accommodative state in Smartphone abusers

et al. 2022

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Background Addiction to Smartphone usage has psychological and physical impacts. However, the state of spasm of accommodation is unclear in Smartphone abusers. Methods We performed a cross-sectional study among adults aged 18–35 years between October 2016 and December 2018. Forty participants were Smartphone abusers according to the Smartphone addiction questionnaire, and 40 participants were non users. We measured auto refraction precycloplegia and postcycloplegia at far for all participants to evaluate the state of spasm of accommodation. We assessed the ultrasound biomicroscopy (UBM) parameters including anterior chamber angle (ACA). Results There was a significant difference in the odds of having spasm of accommodation between Smartphone abusers compared to non-users (OR = 6.64, 95% CI = 1.73–25.47; adjusted OR = 14.63, 95% CI = 2.99–71.62). The Smartphone abusers and non-users groups had a superior ACA median of 30.45° ± 8.3° vs. 26.75° ± 6.6° (P = 0.04) precycloplegia at far and 31.70° ± 11.8° vs. 31.45° ± 8.3° (P = 0.15) postcycloplegia at far, respectively, demonstrated by the Mann-Whitney U test. There was significant higher difference in the precycloplegic nasal ACA at far in the Smartphone abusers group than the non-users group (mean precycloplegic nasal ACA difference = 3.57°, 95% CI = 0.76° - 6.37°), demonstrated by the independent t test. Similarly, there was significant higher difference in the postcycloplegic nasal ACA at far (mean postcycloplegic nasal ACA difference = 4.26°, 95% CI = 1.33° - 7.19°). Conclusions Smartphone abusers are in a condition of accommodation spasm. As a result, cycloplegic refraction should be done for Smartphone abusers.

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Section: Discussionmentioning

confidence: 97%

Ultrasound biomicroscopy study of accommodative state in Smartphone abusers

et al. 2022

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“…During the process of accommodation, the ciliary body, crystalline lens, and iris change actively, resulting in an increase in lens power [16]. This may be associated with an increase in the anterior curvature of the lens [17][18][19][20].…”

Section: Discussionmentioning

confidence: 99%

Changes in anterior segment parameters of normal subjects during accommodation using a Scheimpflug imaging system

Jitendra¹,

Kumar²,

Sah³

et al. 2021

Med Hypothesis Discov Innov Optom

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Background: Accommodation changes ocular parameters, such as the anterior chamber volume (ACV), anterior chamber depth (ACD), anterior chamber angle (ACA), and pupil diameter (PD), which can reflect a risk of angle-closure glaucoma. Previous studies of changes in ocular anterior segment parameters, have used high diopters or maximum amplitude. Here, we focused on normal accommodation at a reading distance of 30‒40 cm. The aim of this study was to assess changes in anterior segment parameters during a normal accommodative state, using a Scheimpflug imaging system. Methods: In this cross-sectional study, 40 emmetrope subjects (mean ± SD of age: 22 ± 4.0 years) who met the inclusion criteria and provided informed consent were enrolled. Clinical history, refraction, amplitude of accommodation, slit lamp examination, Goldman applanation tonometry, and Pentacam investigations were performed on all subjects. Accommodative and non-accommodative targets were induced via the Pentacam. Two seconds were allowed for accommodation or relaxation prior to measurements in each eye. Results: Eighty normal eyes were evaluated; a small but statistically significant change in ACV, ACA, and PD during accommodation (P < 0.01, < 0.01, and < 0.05, respectively) was observed. The ACD did not change substantially with accommodation (P = 0.29). The mean ± SD values of ACV, ACD, ACA, and PD before and after accommodation were 151.85 ± 24.04 mm3 and 145.38 ± 23.30 mm3, 2.87 ± 0.28 mm and 2.86 ± 0.27 mm, 35.06° ± 3.68° and 33.84° ± 3.72°, and 3.46 ± 0.57 mm and 3.41 ± 0.53 mm, respectively. Conclusions: Accommodation changes ocular parameters, such as ACV, ACA, and PD, in healthy young emmetropes. Interestingly, the ACD remains unaltered during accommodation. Nevertheless, although these changes were statistically significant, they were not clinically significant in our study.

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“…The ACD did not show significant difference with accommodation in emmetropic subjects in the study by Dominguez-Vicent et al . 34, 35 . The OA-2000 and Lenstar use similar light spot for focusing and automatically measure along the visual axis, which reduces the accommodation influence.…”

Section: Discussionmentioning

confidence: 99%

Comparison of ocular biometric measurements between a new swept-source optical coherence tomography and a common optical low coherence reflectometry

Chen

Savini

Miao

et al. 2017

Sci Rep

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The purpose of the current study was to compare the measurements between a new optical biometer based on swept-source optical coherence tomography (SS-OCT), the OA-2000 (Tomey, Japan), and an optical biometer based on optical low coherence reflectometry (OLCR), the Lenstar (Haag-Streit, Switzerland). Ninety-nine eyes of 99 healthy subjects were included. The axial length (AL), central corneal thickness (CCT), anterior chamber depth (ACD), aqueous depth (AD), lens thickness (LT), keratometry (K) readings, including flat K (Kf), steep K (Ks), mean K (Km), astigmatism vectors J0, J45 at diameters of 2.5 and 3.0 mm, and white-to-white diameter (WTW) were measured three times each using both biometer in normal eyes by random sequence. Bland-Altman analysis showed good agreement between the SS-OCT and OLCR devices for AL, AD, ACD, LT, with narrow 95% LoA (−0.05 to 0.07 mm, −0.09 to 0.10 mm, −0.10 to 0.09 mm, and −0.06 to 0.22 mm, respectively), and the P values of ACD were both >0.05. The CCT, Kf, Ks, Km, J0, J45 and WTW values provided by the OA-2000 were in good agreement with the Lenstar, and statistically significant differences were detected for some of them but not clinical differences. The agreement was excellent especially for AL.

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

Cited by 9 publications

References 16 publications

Ultrasound biomicroscopy study of accommodative state in Smartphone abusers

Ultrasound biomicroscopy study of accommodative state in Smartphone abusers

Changes in anterior segment parameters of normal subjects during accommodation using a Scheimpflug imaging system

Comparison of ocular biometric measurements between a new swept-source optical coherence tomography and a common optical low coherence reflectometry

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