Measurement of accommodative changes in human eyes by means of a high-resolution ultrasonic system

Lepper, R.-D.; Trier, H. G.

doi:10.1007/978-94-009-3315-6_30

Cited by 6 publications

(3 citation statements)

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“…Soriano [11] found no change in axial length during accommodation. Whereas Lepper and Trier [10] found axial-length elongation during accommodation in some subjects, while it decreased or remained unchanged in others. As a difference from those studies, a larger group of adolescents participated, and newer ultrasonic equipment was used in our study.…”

Section: Discussionmentioning

confidence: 99%

“…Storey and Rabie [8] demonstrated increased axial length, especially in the posterior segment, with increasing accommodation in myopic subjects, while Coleman and Weininger [9] did not detect any changes with M-mode ultrasonography. Lepper and Trier [10] also found that axial length increased during accommodation in some cases, whereas it decreased or remained unchanged in others. Soriano [11] reported no change in axial length during accommodation, while Shum et al [12] found a significant increase in axial length during focusing at near.…”

Section: Introductionmentioning

confidence: 91%

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Does Convergence, Not Accommodation, Cause Axial-Length Elongation at Near?

Bayramlar

Çekıç²,

Hepşen³

1999

Ophthalmic Res

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To determine whether convergence rather than accommodation has a primary effect on the changes in axial length and other biometric components during near fixation, we measured the anterior chamber depth, lens thickness, vitreous length and axial length in the right eyes of 124 young male subjects while their left eyes focused at distance (6 m) and near (20 cm). The measurements were performed before and after cycloplegia in the right eye, so we aimed to study biometric components of the eye in the states of accommodation and nonaccommodation, but converging at near. While the left eye focused at near, the axial length increased significantly with and without cycloplegia (p < 0.0005 and p < 0.0005). The vitreous length was the main increasing ocular biometric component at near both with and without cycloplegia (p < 0.044 and p = 0.001, respectively). At near, there was no difference between two mean axial length and two vitreous length measurements both with and without cycloplegia (p = 0.672 and p = 0.595, respectively). Under cycloplegia, anterior chamber depth also increased significantly at near fixation (p = 0.012). Axial elongation at near fixation, mainly due to an increase in vitreous length, may result from the effect of accommodative convergence rather than accommodation itself. Much use of convergence, not accommodation, may be one of the contributing factors in adult onset and adult progression of myopia.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 91%

Does Convergence, Not Accommodation, Cause Axial-Length Elongation at Near?

Bayramlar

Çekıç²,

Hepşen³

1999

Ophthalmic Res

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“…2, bottom). With high resolution echography it is possible to study accomodative changes [7]. When cataract develops more details of the lens revealed on the echogram caused by acoustic heterogeneity of the lens-capsule, cortex or nucleus (Fig.…”

Section: The Anterior Chamber (Ac)mentioning

confidence: 99%

Diagnostic ultrasound: an aid in the differentiation of anterior segment lesions of the eye

Verbeek

Mitropoulos²

1991

Int Ophthalmol

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Because the part of the globe in direct contact with the transducer cannot be visualised and focussed transducers have poor imaging qualities at a distance less than 5-8 mm from their surface, diagnostic ultrasound of the anterior eye segment has been treated in a stepmotherly way. With a simplified immersion technique we can visualize quite accurately a variety of pathologic conditions of the cornea, anterior chamber, iris, lens and ciliary body. The B-mode information is superior to the A-mode in this part of the eye.

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