Effect of Accommodation on Corneal Topography

Bayramlar, Hüseyin; Sadigov, Fariz; Yildirim, Aydn

doi:10.1097/ico.0b013e31829abdb2

Cited by 15 publications

(10 citation statements)

References 6 publications

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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: 77%

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: 77%

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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“…Whether or not corneal astigmatism changes with accommodation has been the topic of a large number of studies, with some conflicting results as to whether ciliary muscle contraction results in corneal changes . However, most recent studies examining changes in (anterior and posterior) corneal topography with accommodation indicate that the cornea remains stable during accommodation, with any small variations in corneal astigmatism being attributed to cyclotorsional eye movements rather than a true change in corneal curvature (i.e. when small cyclotorsional ocular movements accompanying accommodation are accounted for, the change in corneal parameters is clinically and statistically insignificant).…”

Section: The Clinical Correction Of Astigmatismmentioning

confidence: 99%

The visual and functional impacts of astigmatism and its clinical management

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Vincent

Collins

2014

Ophthalmic Physiologic Optic

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Purpose: To provide a comprehensive overview of research examining the impact of astigmatism on clinical and functional measures of vision, the short and longer term adaptations to astigmatism that occur in the visual system, and the currently available clinical options for the management of patients with astigmatism. Recent findings: The presence of astigmatism can lead to substantial reductions in visual performance in a variety of clinical vision measures and functional visual tasks. Recent evidence demonstrates that astigmatic blur results in short-term adaptations in the visual system that appear to reduce the perceived impact of astigmatism on vision. In the longer term, uncorrected astigmatism in childhood can also significantly impact on visual development, resulting in amblyopia. Astigmatism is also associated with the development of spherical refractive errors. Although the clinical correction of small magnitudes of astigmatism is relatively straightforward, the precise, reliable correction of astigmatism (particularly high astigmatism) can be challenging. A wide variety of refractive corrections are now available for the patient with astigmatism, including spectacle, contact lens and surgical options. Conclusion: Astigmatism is one of the most common refractive errors managed in clinical ophthalmic practice. The significant visual and functional impacts of astigmatism emphasise the importance of its reliable clinical management. With continued improvements in ocular measurement techniques and developments in a range of different refractive correction technologies, the future promises the potential for more precise and comprehensive correction options for astigmatic patients.

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“…The effects of accommodation on the cornea have been evaluated by several investigators. [ 3 4 5 6 7 8 9 10 11 ] It has been shown that corneal curvature changes with age. [ 12 ] The role of the cornea in accommodation may appear insignificant in comparison to the major contribution of the crystalline lens.…”

Section: Introductionmentioning

confidence: 99%

Effect of cycloplegia on corneal biometrics and refractive state

Bagheri

Feizi

Shafii

et al. 2018

J Ophthalmic Vis Res

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Purpose:To determine changes in refractive state and corneal parameters after cycloplegia with cyclopentolate hydrochloride 1% using a dual Scheimpflug imaging system.Methods:In this prospective cross-sectional study patients aged 10 to 40 years who were referred for optometric evaluation enrolled and underwent autorefraction and corneal imaging with the Galilei dual Scheimpflug system before and 30 minutes after twice instillation of medication. Changes in refraction and astigmatism were investigated. Corneal biometrics including anterior and posterior corneal curvatures, total corneal power and corneal pachymetry were compared before and after cycloplegia.Results:Two hundred and twelve eyes of 106 subjects with mean age of 28 ± 5 years including 201 myopic and 11 hyperopic eyes were evaluated. Mean spherical equivalent refractive error before cycloplegia was -3.4 ± 2.6 D. A mean hyperopic shift of 0.4 ± 0.5 D occurred after cycloplegia (P < 0.001). The astigmatism power did not significantly change (P = 0.8), however, 26.8% of eyes with significant astigmatism experienced a change of more than 5 degrees in the axis of astigmatism. Changes in posterior corneal curvature were scant but statistically significant (P = 0.001). Moreover, corneal thickness was slightly increased in the central and paracentral regions (P < 0.001 and P < 0.001, respectively).Conclusion:Cycloplegia causes a hyperopic shift and astigmatism axis changes, along with an increase in central and paracentral corneal thickness and change in posterior corneal curvature. The effects of cycloplegia on refraction and corneal biometrics should be considered before cataract and refractive surgeries.

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Effect of Accommodation on Corneal Topography

Abstract: During accommodation, the cornea does not change curvature and the eye does not appear to significantly cyclotort.

Cited by 15 publications

References 6 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

The visual and functional impacts of astigmatism and its clinical management

Effect of cycloplegia on corneal biometrics and refractive state

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