Abstract
BackgroundHighly myopic eyes differ in morphology from emmetropic eyes, and the correct estimation of the vitreous volume is difficult. To explore an effective method to estimate ocular volume using refractive factors in children.MethodsThis is a retrospective study of children with high myopia who visited the Shenzhen Shekou People’s Hospital (July-December 2018) before undergoing posterior scleral reinforcement surgery. Data on refractive factors and ocular 3D reconstruction imaging based on high-end CT were collected for linear correlation and linear regression analyses.ResultsTen patients (20 eyes) were included. There are nine males and one female. They were 4 to 12 years of age. The spherical equivalent ranges from + 0.25 to -20.00 D. The cylindrical equivalent ranges from − 0.50 to -6.25 D. The AL(axial length, AL) ranges from 21.78 to 33.90 mm. The corneal curvature (mean) ranges from 42.44 to 46.75. The 3D reconstruction of the CT images shows that the ocular volume ranges from 4.591 to 10.988 ml. The ocular volume of the 20 eyes decreases with the increase of diopter and total curvature, both presenting a linear trend, with the Pearson correlation coefficients being − 0.776 (P < 0.001) and − 0.633 (P = 0.003), respectively. The ocular volume of the 20 eyes increases with the increasing AL, also presenting a linear trend, with the Pearson correlation coefficient being 0.939 (P < 0.001).ConclusionsIn children, the ocular volume is negatively and linearly correlated with the diopter and curvature, and positively and linearly correlated with the AL.
Highlights
Myopic eyes differ in morphology from emmetropic eyes, and the correct estimation of the vitreous volume is difficult
For rhegmatogenous retinal detachment, one of the common complications of high myopia, intravitreal injection of exogenous filling is required in the reduction surgery for retinal detachment and posterior vitrectomy [15, 16].The amount of filling and intraocular pressure (IOP) control directly determines the prognosis of retinal reattachment [15, 16], but it is subject to subjective judgments as the vitreous volume of highly myopic eyes varies greatly between individuals [17]
Some scholars have paid attention to the morphology of posterior scleral staphyloma and the thinning of intraocular optic nerve after the axial length elongation [18, 19], few scholars have studied the problem of enlarged eyeball volume, which is really a problem that needs the attention of surgeons before vitrectomy and posterior scleral reinforcement
Summary
Myopic eyes differ in morphology from emmetropic eyes, and the correct estimation of the vitreous volume is difficult. Existing treatments are focusing on controlling the increase of the axial length and curing common complications [10, 11]. Surgical treatments include vitrectomy, internal limiting membrane removal, Jiang et al BMC Ophthalmology (2021) 21:326 internal limiting membrane packing, posterior scleral reinforcement, and intravitreal injection of anti-vascular endothelial growth factor [12,13,14]. For rhegmatogenous retinal detachment, one of the common complications of high myopia, intravitreal injection of exogenous filling is required in the reduction surgery for retinal detachment and posterior vitrectomy [15, 16].The amount of filling and intraocular pressure (IOP) control directly determines the prognosis of retinal reattachment [15, 16], but it is subject to subjective judgments as the vitreous volume of highly myopic eyes varies greatly between individuals [17]. A method to estimate the volume by diopter might provide quantitative data for clinical practice
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