Optic disk ovality as an index of tilt and its relationship to myopia and perimetry

Tay, Eugene; Seah, S.K.W.; Chan, Siew‐Pang; Lim, Albert T.H.; Chew, Sek-Jin; Foster, Paul J.; Aung, Tin

doi:10.1016/j.ajo.2004.08.076

Cited by 248 publications

(215 citation statements)

References 25 publications

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“…However, this index was not comparable among patients because the optic disc dimensions measured in fundus photography may not be the true dimensions of the optic discs. 67 The true angle of tilt can now be measured using OCT. 68 Although the size of optic discs in normal eyes showed significant variation, its relationship with axial length and myopia is still a matter of contention. Two groups of investigators using SD OCT reported an inverse correlation between optic discs size with either refractive error or axial length, but the authors did not perform image size corrections for magnification variations.…”

Section: Optic Nerve Headmentioning

confidence: 99%

Advances of optical coherence tomography in myopia and pathologic myopia

Cheung

Luk

et al. 2016

Eye

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Section: Optic Nerve Headmentioning

confidence: 99%

Advances of optical coherence tomography in myopia and pathologic myopia

Cheung

Luk

et al. 2016

Eye

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“…[26][27][28] An examiner examined color fundus photographs of the optic disc taken at a 458 viewing angle and plotted 14 points along the disc margin. Software developed by our group automatically drew an ellipse along the contour of the optic disc to determine centers of gravity and maximum and minimum diameters of each optic disc.…”

Section: Measurements Of Optic Disc Ovalitymentioning

confidence: 99%

Retinal Nerve Fiber Layer Defects in Highly Myopic Eyes with Early Glaucoma

Kimura¹,

Hangai²,

Morooka³

et al. 2012

Invest. Ophthalmol. Vis. Sci.

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PURPOSE.To compare the retinal nerve fiber layer (RNFL) defects in early glaucomatous eyes between highly and nonhighly myopic eyes.METHODS. Sixty-one highly myopic eyes (< À6.0 diopters [D]) of 61 patients and 55 non-highly myopic eyes of 55 patients with early visual field (VF) defects were studied. The angular locations and widths of the RNFL defects were measured from red-free fundus photographs. The RNFL defect closest to the fovea was designated the ''nearest RNFL defect'' of each hemisphere.RESULTS. In total, 131 RNFL defects were found in highly myopic eyes and 82 in non-highly myopic eyes. Twenty-seven (44.3%) of the 61 highly myopic eyes, but only 8 (14.5%) of the 55 non-highly myopic eyes had their nearest RNFL defects between 08 and 108 (P < 0.001). Although the frequencies of paracentral scotomas were comparable between the two groups, the rate of inferotemporal paracentral scotomas was significantly higher in the high myopia group (P ¼ 0.02). The numbers of nearest RNFL defects in the superior hemisphere or extending over both hemispheres were significantly higher in the high-myopia group. Multiple logistic regression analyses showed that high myopia and the nearest RNFL defect involving the papillomacular bundle were significantly associated with paracentral scotomas (odds ratio [OR]: 4.78, P < 0.05, and OR: 5.31, P < 0.001, respectively). High myopia was significantly associated with the nearest RNFL defect involving the papillomacular bundle (OR: 2.95, P < 0.05).CONCLUSIONS. These findings suggest that highly myopic eyes are more susceptible to papillomacular bundle damage in early glaucoma. (Invest Ophthalmol Vis Sci. 2012;53:6472-6478)

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“…Optic disc tilt was identified by the tilt ratio, defined as the ratio between the longest (LD) and shortest (SD) diameters of the optic disc (tilt ratio ¼ LD/SD). [16][17][18] Optic disc torsion was defined as the deviation of the long axis of the optic disc from the vertical meridian. 4,5 The vertical meridian was identified as a vertical line 901 from a horizontal line connecting the fovea, which is 21 to 61 below the optic disc, to the center of the optic disc.…”

Section: Subjectsmentioning

confidence: 99%

Posterior staphyloma is related to optic disc morphology and the location of visual field defect in normal tension glaucoma patients with myopia

Park

Jung

Park

2014

Eye

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Purpose To determine the morphologic features of the optic disc and the location of visual field (VF) defect in relation to posterior staphyloma in normal tension glaucoma (NTG) eyes with myopia. Methods One hundred and thirty-four NTG patients with myopia were enrolled. B-scan ultrasonography was performed in enrolled patients. Disc tilt ratio, disc torsion, and area of peripapillary atrophy were measured from disc photographs. Patients were classified according to the presence of posterior staphyloma and its location: staphyloma involving the optic disc, staphyloma involving either the supero-temporal side of the optic disc or the infero-temporal side of the optic disc. The relationship between the location of the posterior staphyloma and that of the VF defect was analyzed. Results Among 134 eyes, 74 eyes (55.2%) had posterior staphyloma on B-scan ultrasonography. Mean torsion degree was significantly greater in eyes with staphyloma involving the temporal side of the optic disc (19.78±18.001) compared with eyes with staphyloma involving the optic disc (4.65±4.921, P ¼ 0.001). The frequency of the location of VF damage differed significantly between eyes with staphyloma involving the supero-temporal side and those involving the infero-temporal side of the optic disc (P ¼ 0.008), which was not significant in eyes with staphyloma involving the optic disc (P ¼ 0.813).Conclusions Optic disc torsion was a prominent finding in myopic NTG eyes when posterior staphyloma was located temporal to the optic disc. The location of posterior staphyloma was related to the direction of disc torsion and the location of VF defect.

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Optic disk ovality as an index of tilt and its relationship to myopia and perimetry

Cited by 248 publications

References 25 publications

Advances of optical coherence tomography in myopia and pathologic myopia

Advances of optical coherence tomography in myopia and pathologic myopia

Retinal Nerve Fiber Layer Defects in Highly Myopic Eyes with Early Glaucoma

Posterior staphyloma is related to optic disc morphology and the location of visual field defect in normal tension glaucoma patients with myopia

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