Anterior ophthalmic imaging

Wolffsohn, James S.; Peterson, Rachael C.

doi:10.1111/j.1444-0938.2006.00065.x

Cited by 16 publications

(14 citation statements)

References 55 publications

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“…The values of ASC and PSC have been measured by several methods both in vivo, [26], [31] and in vitro, [32], [33] and similar results were reported. For instance, Chien CH.…”

Section: Discussionsupporting

confidence: 63%

Biometry of Anterior Segment of Human Eye on Both Horizontal and Vertical Meridians during Accommodation Imaged with Extended Scan Depth Optical Coherence Tomography

et al. 2014

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PurposeTo determine the biometry of anterior segment dimensions of the human eye on both horizontal and vertical meridians with extended scan depth optical coherence tomography (OCT) during accommodation.MethodsTwenty pre-presbyopic volunteers, aged between 24 and 30, were recruited. The ocular anterior segment of each subject was imaged using an extended scan depth OCT under non- and 3.0 diopters (D) of accommodative demands on both horizontal and vertical meridians. All the images were analyzed to yield the following parameters: pupil diameter (PD), anterior chamber depth (ACD), anterior and posterior surface curvatures of the crystalline lens (ASC and PSC) and the lens thickness (LT). Two consecutive measurements were performed to assess the repeatability and reproducibility of this OCT. They were evaluated by calculating the within-subject standard deviation (SD), a paired t-test, intra-class correlation coefficients (ICC) and the coefficient of repeatability/reproducibility (CoR).ResultsThere were no significant differences between two consecutive measurements on either horizontal or vertical meridians under both two different accommodative statuses (P>0.05). The ICC for all parameters ranged from 0.775 to 0.998, except for the PSC (0.550) on the horizontal meridian under the non-accommodative status. In addition, the CoR for most of the parameters were excellent (0.004% to 4.89%). In all the parameters, only PD and PSC were found different between the horizontal and vertical meridians under both accommodative statuses (P<0.05). PD, ACD, ASC and PSC under accommodative status were significantly smaller than those under the non-accommodative status, except that the PSC at the vertical meridian did not change. In addition, LT was significantly increased when accommodation.ConclusionThe extended scan depth OCT successfully measured the dimensions of the anterior eye during accommodation with good repeatability and reproducibility on both horizontal and vertical meridians. The asymmetry of lens posterior surface and oval-shaped pupil were found during accommodation.

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“…The values of ASC and PSC have been measured by several methods both in vivo, [26], [31] and in vitro, [32], [33] and similar results were reported. For instance, Chien CH.…”

Section: Discussionsupporting

confidence: 63%

Biometry of Anterior Segment of Human Eye on Both Horizontal and Vertical Meridians during Accommodation Imaged with Extended Scan Depth Optical Coherence Tomography

et al. 2014

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“…1,2 Similar to ultrasound, OCT also provides crosssectional images of tissue in situ, using light instead of sound, with reported resolutions between 10 to 25 m. 3,4 The ability to image tissue in vivo noninvasively, coupled with its nominal axial resolution, makes the OCT particularly suited for evaluation of ocular structures. More recently, applications of the OCT have evolved to include the evaluation of anterior structures such as the cornea and limbus, 5,6 the tear film, 7 and the tear meniscus height (TMH).…”

mentioning

confidence: 98%

Variability of the Analysis of the Tear Meniscus Height by Optical Coherence Tomography

Bitton

Keech

Simpson

et al. 2007

Optometry and Vision Science

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“…In all optical methods the iris pigment constitutes an obstacle to viewing the important structures of the lens equator. 1 Ultrasound biomicroscopy is vulnerable to distortion because of different sound velocities in different ocular and related media. All acoustic and light detection methods are therefore subject to image distortion by the intervening surfaces and require mathematical remodeling.…”

mentioning

confidence: 99%

“…All acoustic and light detection methods are therefore subject to image distortion by the intervening surfaces and require mathematical remodeling. 1 Magnetic resonance imaging (MRI) is a valuable tool in the field of medical imaging. The eye is an ideal tissue for high-field MRI because of its wide variation in water content and in particular because of the requirement for high spatial resolution in a small field of view (FoV).…”

mentioning

confidence: 99%