Kyoung Min Lee1, Sun-Won Park2, Martha Kim3, Sohee Oh4, Seok Hwan Kim5. 1. Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea; Department of Ophthalmology, Seoul National University Boramae Medical Center, Seoul, Korea. 2. Department of Radiology, Seoul National University College of Medicine, Seoul, Korea; Department of Radiology, Seoul National University Boramae Medical Center, Seoul, Korea. 3. Department of Ophthalmology, Dongguk University Ilsan Hospital, Goyang, Korea. 4. Department of Biostatistics, Seoul National University Boramae Medical Center, Seoul, Korea. 5. Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Korea; Department of Ophthalmology, Seoul National University Boramae Medical Center, Seoul, Korea. Electronic address: xcski@hanmail.net.
Abstract
PURPOSE: To determine if the 3-dimensional (3D) eyeball shape is associated with the positions of the central retinal vascular trunk (CRVT) and the externally oblique border (EOB) in the optic nerve head (ONH). DESIGN: Prospective, cross-sectional study. PARTICIPANTS: Fifty-six subjects (112 eyes) with a diagnosis of glaucoma or glaucoma suspect. METHODS: The eyeball shape on 3D magnetic resonance imaging (MRI) scans was classified according to the dimension of the longest diameter: axial dimension (prolate sphere), group 1; horizontal dimension (horizontally oblate sphere), group 2; and vertical dimension (vertically oblate sphere), group 3. The deviation of the CRVT, as a surrogate of lamina cribrosa (LC) shift, was measured from the center of the Bruch's membrane opening (BMO) demarcated by OCT imaging, with the horizontal midline as 0° and the superior location as a positive value. The angular location of the longest EOB was also measured. MAIN OUTCOME MEASURE: Positions of CRVT and EOB according to the 3D eyeball shape. RESULTS: Among 112 eyes, 54 (48%) had a prolate shape (group 1), 23 (21%) had a horizontally oblate shape (group 2), and 35 (31%) had a vertically oblate shape (group 3). The angular deviation of the CRVT differed among the groups: to the nasal side in group 1, to the temporal side in group 2, and along the vertical meridian in group 3. In cases of asymmetric eyeball shape, the CRVT was deviated toward the undergrown side from the overgrown side, regardless of grouping. The angular location of the longest EOB was in the direction opposite to the CRVT position (P < 0.001). A generalized estimating equation analysis revealed that the temporal location of the CRVT was associated with older age (P = 0.001), nasal location of the longest EOB (P < 0.001), and oblate shape of the eyeball (P < 0.001, group 2; P = 0.007, group 3). CONCLUSIONS: The position of the CRVT and EOB were associated with the 3D eyeball shape. Considering that infant ONH morphology is highly uniform, various modes of eyeball expansion during growth can result in diverse directionalities of offset between the LC and the BMO in adults.
PURPOSE: To determine if the 3-dimensional (3D) eyeball shape is associated with the positions of the central retinal vascular trunk (CRVT) and the externally oblique border (EOB) in the optic nerve head (ONH). DESIGN: Prospective, cross-sectional study. PARTICIPANTS: Fifty-six subjects (112 eyes) with a diagnosis of glaucoma or glaucoma suspect. METHODS: The eyeball shape on 3D magnetic resonance imaging (MRI) scans was classified according to the dimension of the longest diameter: axial dimension (prolate sphere), group 1; horizontal dimension (horizontally oblate sphere), group 2; and vertical dimension (vertically oblate sphere), group 3. The deviation of the CRVT, as a surrogate of lamina cribrosa (LC) shift, was measured from the center of the Bruch's membrane opening (BMO) demarcated by OCT imaging, with the horizontal midline as 0° and the superior location as a positive value. The angular location of the longest EOB was also measured. MAIN OUTCOME MEASURE: Positions of CRVT and EOB according to the 3D eyeball shape. RESULTS: Among 112 eyes, 54 (48%) had a prolate shape (group 1), 23 (21%) had a horizontally oblate shape (group 2), and 35 (31%) had a vertically oblate shape (group 3). The angular deviation of the CRVT differed among the groups: to the nasal side in group 1, to the temporal side in group 2, and along the vertical meridian in group 3. In cases of asymmetric eyeball shape, the CRVT was deviated toward the undergrown side from the overgrown side, regardless of grouping. The angular location of the longest EOB was in the direction opposite to the CRVT position (P < 0.001). A generalized estimating equation analysis revealed that the temporal location of the CRVT was associated with older age (P = 0.001), nasal location of the longest EOB (P < 0.001), and oblate shape of the eyeball (P < 0.001, group 2; P = 0.007, group 3). CONCLUSIONS: The position of the CRVT and EOB were associated with the 3D eyeball shape. Considering that infant ONH morphology is highly uniform, various modes of eyeball expansion during growth can result in diverse directionalities of offset between the LC and the BMO in adults.
Authors: Hyung Bin Hwang; Ji Su Yeon; Geo Seong Moon; Ha Na Jung; Jae Young Kim; Seung Hee Jeon; Joon Myoung Yoon; Hyo Won Kim; Yong Chan Kim Journal: Transl Vis Sci Technol Date: 2022-07-08 Impact factor: 3.048