Influence of accommodation on the anterior and posterior cornea

Read, Scott A.; Buehren, Tobias F.; Collins, Michael J.

doi:10.1016/j.jcrs.2007.06.048

Cited by 42 publications

(54 citation statements)

References 39 publications

(41 reference statements)

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“…Finally, and in spite of these contradictory results among all previous studies [6][7][8][9][17][18][19], it should be taken into account that only three studies assessed corneal changes at different accommodation ranges [6,9,17]. Concretely, these studies reported that corneal changes are not statistically significant during accommodation, and are in agreement with those obtained previously.…”

Section: Central Corneal Thicknesssupporting

confidence: 83%

“…In this regard, some studies have assessed the corneal periphery (R>7.0 mm), and reported changes in the corneal curvature, volume and aberrations with accommodation [6][7][8]16]. Contrarily, other studies hypothesized that corneal changes with the accommodation are associated with the cyclotorsion produced in the corneal topography [17,18]. Nevertheless, when that rotation was corrected, corneal changes were reduced considerably and were not significant.…”

Section: Central Corneal Thicknessmentioning

confidence: 99%

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Non-invasive measurements of the dynamic changes in the ciliary muscle, crystalline lens morphology, and anterior chamber during accommodation with a high-resolution OCT

Esteve-Taboada

Domínguez‐Vicent

Monsálvez-Romín

et al. 2017

Graefes Arch Clin Exp Ophthalmol

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Section: Central Corneal Thicknesssupporting

confidence: 83%

Section: Central Corneal Thicknessmentioning

confidence: 99%

Non-invasive measurements of the dynamic changes in the ciliary muscle, crystalline lens morphology, and anterior chamber during accommodation with a high-resolution OCT

Esteve-Taboada

Domínguez‐Vicent

Monsálvez-Romín

et al. 2017

Graefes Arch Clin Exp Ophthalmol

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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%

“…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. After -5 D accommodation, the mean ACD decreased approximately by 0.11 mm and 0.14 mm, respectively.…”

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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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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“…21 In our study, HOA RMS and spherical aberration increased with age. Previous studies 11,28 have evaluated the possible role of corneal pseudoaccommodation. With respect to ocular cyclotorsion, examinations did not confirm changes in the topography of the cornea during accommodation, 11,29 nor did our study verify such corneal deviations during accommodation.…”

Section: Discussionmentioning

confidence: 99%

Accommodation in phakic and pseudophakic eyes measured with subjective and objective methods

Németh

Lipécz

Szalai

et al. 2013

Journal of Cataract and Refractive Surgery

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PURPOSE:To measure accommodation subjectively and objectively and assess anterior segment changes during accommodation in phakic eyes and pseudophakic eyes. METHODS: Subjective and objective accommodation measurements and pupillometry were performed in phakic and pseudophakic patients. Refraction and pupil diameter were recorded with different accommodation stimuli. Corneal higher-order aberrations (HOAs) and anterior chamber depths (ACDs) were detected with a rotating Scheimpflug camera. RESULTS:The mean age of the 44 patients in the phakic group was 36.34 years G 16.6 (SD) and of the 27 patients in the pseudophakic group, 69.3 G 9.98 years. The mean subjective accommodation was 4.49 G 3.48 diopters (D) in phakic eyes and showed significant correlation with age, spherical aberration, changes in pupil diameter, and ACD. The mean subjective accommodation was 0.50 G 0.28 D in pseudophakic eyes. In phakic eyes, the mean objective accommodation was 0.46 G 1.02 D, 1.06 G 1.33 D, and 2.2 G 1.9 D with 2.0 D, 3.0 D, and 5.0 D, respectively, of stimulus. In pseudophakic eyes, measurable objective accommodation was recorded. In phakic eyes, the correlations were significant between these values and age, changes in ACD, pupil size, and corneal spherical aberration. In pseudophakic eyes, the only correlation was with the spherical equivalent value.

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Influence of accommodation on the anterior and posterior cornea

Abstract: Small cyclotorsional eye movements occurred with accommodation. When these eye movements were accounted for in data analysis, no consistent significant change in the topography of the cornea was found with accommodation across an 8.0 to 9.0 mm corneal diameter.

Cited by 42 publications

References 39 publications

Non-invasive measurements of the dynamic changes in the ciliary muscle, crystalline lens morphology, and anterior chamber during accommodation with a high-resolution OCT

Non-invasive measurements of the dynamic changes in the ciliary muscle, crystalline lens morphology, and anterior chamber during accommodation with a high-resolution OCT

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

Accommodation in phakic and pseudophakic eyes measured with subjective and objective methods

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