Measurement of normal ocular volume by the use of computed tomography

Igbinedion, BO; Ogbeide, OU

doi:10.4103/1119-3077.113453

Cited by 23 publications

(31 citation statements)

References 8 publications

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“…Eye size in this study did not correlate with skull type, in accordance with a previous study . Eye size did not correlate with gender in our study–this association varied in other veterinary and human studies …”

Section: Discussioncontrasting

confidence: 43%

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Ocular biometry by computed tomography in different dog breeds

Chiwitt

Mahoney²,

Tanner

et al. 2016

Veterinary Ophthalmology

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Section: Discussioncontrasting

confidence: 43%

“…Computed tomography is widely used for ocular biometry in people, both for research and to establish reference ranges for certain cohorts . Standard measurement methods have been established .…”

Section: Introductionmentioning

confidence: 99%

Ocular biometry by computed tomography in different dog breeds

Chiwitt

Mahoney²,

Tanner

et al. 2016

Veterinary Ophthalmology

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“…Our preoperative eyeball volumes obtained by manual segmentation (left eyeball, 6.07 mL; and right eyeball, 5.81 mL) were slightly greater than the values for healthy males in the 11-20 age group, which are 4.74 mL for the left eyeball and 4.62 mL for the right eyeball. 17 These results may not accurately reproduce real eyeball volumes owing to the estimation method, which was based only on the anteroposterior and transverse longest diameter. The results presented by Acer et al 12 using the point-counting method for a group of 40 subjects with a mean age of 40 AE 6 years revealed a higher volume value of 7.45 mL for both eyeballs.…”

Section: Discussionmentioning

confidence: 94%

Three-Dimensional Eyeball and Orbit Volume Modification After LeFort III Midface Distraction

Smektała

Nysjö

Thor

et al. 2015

Journal of Craniofacial Surgery

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The aim of our study was to evaluate orbital volume modification with LeFort III midface distraction in patients with craniosynostosis and its influence on eyeball volume and axial diameter modification. Orbital volume was assessed by the semiautomatic segmentation method based on deformable surface models and on 3-dimensional (3D) interaction with haptics. The eyeball volumes and diameters were automatically calculated after manual segmentation of computed tomographic scans with 3D slicer software. The mean, minimal, and maximal differences as well as the standard deviation and intraclass correlation coefficient (ICC) for intraobserver and interobserver measurements reliability were calculated. The Wilcoxon signed rank test was used to compare measured values before and after surgery. P < 0.05 was considered statistically significant. Intraobserver and interobserver ICC for haptic-aided semiautomatic orbital volume measurements were 0.98 and 0.99, respectively. The intraobserver and interobserver ICC values for manual segmentation of the eyeball volume were 0.87 and 0.86, respectively. The orbital volume increased significantly after surgery: 30.32% (mean, 5.96 mL) for the left orbit and 31.04% (mean, 6.31 mL) for the right orbit. The mean increase in eyeball volume was 12.3%. The mean increases in the eyeball axial dimensions were 7.3%, 9.3%, and 4.4% for the X-, Y-, and Z-axes, respectively. The Wilcoxon signed rank test showed that preoperative and postoperative eyeball volumes, as well as the diameters along the X- and Y-axes, were statistically significant. Midface distraction in patients with syndromic craniostenosis results in a significant increase (P < 0.05) in the orbit and eyeball volumes. The 2 methods (haptic-aided semiautomatic segmentation and manual 3D slicer segmentation) are reproducible techniques for orbit and eyeball volume measurements.

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“…Both age and sex are known to affect CC size, ocular globe size and position, and brainstem size [40][41][42][43][44] . We carefully matched unaffected individuals by age and sex to avoid confounding by these factors in our analysis.…”

Section: Discussionmentioning

confidence: 99%

Alterations in Brain Morphology by MRI in Adults with Neurofibromatosis 1

Wang

Mautner

Friedman

et al. 2019

Preprint

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Objective: To explore and characterize alterations in brain morphology by MRI in adults with neurofibromatosis 1 (NF1). Methods: MRI measurements of 29 intracranial structures were obtained for 389 adults with NF1 and 112 age- and sex-matched unaffected control subjects. A subset of NF1 patients (n = 70) was also assessed for clinical severity of NF1 features and neurological problems and received psychometric testing for attention deficiencies and IQ. Brain morphological measurements were compared between NF1 and control subjects, and correlation analyses were performed between principal components of the intracranial measurements and clinical and psychometric features. Results: Four of nine corpus callosum measurements were significantly greater in adults with NF1 than in sex- and age-matched controls. All seven brainstem measurements were significantly greater in adults with NF1 than in controls. No robust correlations were observed between the size of these structures and clinical or neuropsychometric assessments. Conclusions: Our findings are consistent with the hypothesis that dysregulation of brain myelin production is an important manifestation of NF1 in adults.

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Measurement of normal ocular volume by the use of computed tomography

Abstract: Ocular volume correlated positively with the age of the patients to about 50 years after which some reduction was observed. We noted that males had slightly larger eyeballs in comparison to females, although not at statistical significant level.

Cited by 23 publications

References 8 publications

Ocular biometry by computed tomography in different dog breeds

Ocular biometry by computed tomography in different dog breeds

Three-Dimensional Eyeball and Orbit Volume Modification After LeFort III Midface Distraction

Alterations in Brain Morphology by MRI in Adults with Neurofibromatosis 1

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