ABSTRACT
Purpose: The proportion of axial length (AL) occupied by vitreous chamber depth (VCD), or VCD:AL, consistently correlates to ocular biometry in the general population. Relation of VCD:AL to ocular biometry in high myopia is not known. The purpose of this study is to evaluate the relation of VCD and VCD:AL to ocular biometry of highly myopic eyes. Methods: This was a cross?sectional retrospective study of records of 214 myopic eyes (<?1 D SE, aged 20–40 years) attending the refractive surgery services. High axial myopia was defined as AL >26.5 mm. Eyes with posterior staphyloma and myopic maculopathy were excluded. Records were assessed for measurements of AL, central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT), white to white diameter (WTW), and vitreous chamber depth (VCD). Groups were formed based on increasing AL, while the sum of CCT, ACD, and LT was recorded as anterior segment depth (AS). The main outcome measure was the correlation of VCD and VCD:AL to ocular biometry. A comparison was also performed based on of degree of axial myopia. Results: Mean age of the patients was 27.0 ± 5.2 years. VCD showed a very strong correlation with AL (R = 0.98, P < 0.001) but did not correlate to any anterior parameter. VCD:AL showed moderate negative relation with AS (R = ?0.43, P < 0.001) and ACD (R = ?0.3, P < 0.001), while it had a weakly negative relation with LT (R = ?0.18, P = 0.006). VCD:AL showed strong negative relation (R > ~0.7) with AS in all individual groups of AL. Among anterior parameters, WTW showed the most consistent relation with ocular biometry. Conclusion: VCD:AL is a better correlate of ocular biometry in high myopia as compared to VCD. However, the correlation is weaker than that noted by previous studies done on the general population. Longitudinal studies of VCD:AL in the younger age group is recommended
ABSTRACT
Purpose: To study the clinical profile and magnetic resonance imaging (MRI) features in patients of COVID?19?associated rhino?orbital?cerebral mucormycosis (CA?ROCM) with orbital involvement and perform a clinicoradiological correlation. Methods: A cross?sectional study was performed at a tertiary care center in north India from May 2021 to June 2021. Consecutive patients with clinical, nasal endoscopic, and/or microbiological evidence of CA?ROCM underwent MRI of paranasal sinuses, orbit, and brain as per the study protocol. Orbital MRI findings were studied in detail and were correlated with clinical signs. Results: Two hundred and seventy patients were studied. The mean age was 48.4 (± 16.82) years. A male predilection was noted (male:female = 1.77). Orbital involvement was seen in 146 (54%) patients on clinical evaluation and in 184 (68%) patients on MRI. Unilateral orbital involvement was more common (134; 92%). The most common presenting symptom was periorbital and/or facial pain (141; 52.2%) and the most common clinical sign was periorbital edema (116; 43%). The most common MRI finding was suggestive of orbital cellulitis (160; 59%). Orbital compartment syndrome was found in 17 (6.3%) patients. The inter?rater agreement between clinical and radiological assessments to detect the involvement of infraorbital nerve and frontal nerve was found to be 85.56%, (? 0.621) and 93.70% (? 0.776), respectively. The diagnostic accuracy, sensitivity, and specificity of MRI to detect medial orbital wall defect were found to be 87.9%, 65%, and 97%, respectively. Conclusion: Orbital imaging features of a cohort of ROCM patients have been presented with clinicoradiological correlation.