Clinical utility of anterior segment optical coherence tomography in strabismus surgery: Prospective observational study

John, Joseph; Joseph, Elizabeth; Meena, CK; Sathyan, Sanitha

doi:10.4103/kjo.kjo_32_17

Cited by 4 publications

(37 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The distance between the cornea and the insertion site of the rectus EOM was similar to that reported previously (Table 4) [16][17][18][19][20][21][22][23]. However, Indians have a longer average of 8.7 mm of LR and 7.3 mm of MR in the direct measurements [19].…”

Section: Plos Onesupporting

confidence: 86%

See 1 more Smart Citation

Shape analysis of rectus extraocular muscles with age and axial length using anterior segment optical coherence tomography

et al. 2020

View full text Add to dashboard Cite

Purpose This study aimed to evaluate the shape of the extraocular muscles (EOMs) in normal subjects using the en-face images of anterior segment optical coherence tomography (AS-OCT). The EOM insertion and the direction of the muscle fibers were investigated. Subjects and methods A total of 97 healthy normal subjects (194 eyes) at Okayama University Hospital (age, 47.1±21.5 years; range, 8–79 years) participated in the study. A series of 256 tomographic images of the rectus EOMs were captured using the C-scan function of the AS-OCT (CASIA2, TOMEY Co., Japan), and the images were converted to en-face images in multi-TIFF format. The anterior chamber angle to EOM insertion distance (AID) and the angle of the muscle fibers from the insertion site (angle of muscles) were measured from the images. The correlations of AID and angle of muscles with age and axial length were investigated and evaluated. Results AID and angle of muscles were significantly correlated with age or axial length in some EOMs. The AIDs of medial rectus (MR) (P = 0.000) and superior rectus (SR) (P = 0.005) shortened with age. The AIDs of MR (P = 0.001) and inferior rectus (IR) (P = 0.035) elongated with axial length, whereas lateral rectus (LR) (P = 0.013) shortened. The angles of MR (P = 0.001) and LR (P = 0.000) were found to have a more downward direction toward the posterior in older subjects. Conclusion En-face images can be created by AS-OCT, and the shape of the EOMs in normal subjects using these image measurements was available. With the ability to assess the EOMs, AID and angle of muscles are expected give useful information for treating and diagnosing strabismus-related diseases.

show abstract

Section: Plos Onesupporting

confidence: 86%

“…However, Indians have a longer average of 8.7 mm of LR and 7.3 mm of MR in the direct measurements [ 19 ]. In the AS-OCT reports, Indians also have a longer average than other races [ 17 ]. AID may vary by race.…”

Section: Discussionmentioning

confidence: 99%

Shape analysis of rectus extraocular muscles with age and axial length using anterior segment optical coherence tomography

et al. 2020

View full text Add to dashboard Cite

show abstract

“…A measurement difference of ⩽1 mm between values was considered "clinically acceptable," taking into consideration the previous study on comparison of OCT and caliper measurements. 1,3,5,12,20 Agreement between preoperative OCT values and intraoperative caliper values were calculated using Bland-Altman plots with 95% confidence intervals. Quantitative data was analyzed using statistical package for social sciences (SPSS) 23.0 (SPSS Corporation, USA09).…”

Section: Discussionmentioning

confidence: 99%

“…Castroviejo caliper is considered as the gold standard for intraoperative assessment of insertion distance. 1 Conventional scans such as Computed Tomography (CT), Ultrasonography B (USG-B) scan and Magnetic Resonance Imaging (MRI) have been tried for the measurement of extraocular muscle insertion from the limbus but the use of these scans is limited due to low accuracy and low image resolution. [2][3][4] Furthermore, these imaging techniques may require sedation or general anesthesia in children, expose children to radiation and are expensive.…”

Section: Introductionmentioning

confidence: 99%

“…5,6 UBM is a recent advancement in accurately measuring the insertion of extraocular muscle but it has limited patient compliance due to its contact feature and also pressing of the eyeball during scanning can induce errors in calculating extraocular muscle insertion. 1 Optical coherence tomography (OCT) is a relatively newer imaging modality, which uses the principle of low coherence interferometry. This principle can be used to obtain high resolution cross sectional images of ocular structures in vivo.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Accuracy of anterior segment optical coherence tomography for pre-operative localization of insertions of extraocular recti muscles

Jayaraj

Singh

Agrawal

et al. 2020

European Journal of Ophthalmology

View full text Add to dashboard Cite

Introduction: To study the accuracy of anterior segment optical coherence tomography (AS-OCT) function of Cirrus HD-OCT 500 (Carl Zeiss Meditec, Dublin, CA) in calculating the insertion of rectus muscles from the limbus in patients undergoing primary squint surgery. Methodology: A prospective, double-masked, observational study was conducted on 128 muscles of 46 patients with strabismus who were planned for strabismus surgery between January 2019 and December 2019. Insertion distance from limbus was measured using AS-OCT function of Cirrus HD-OCT 500 preoperatively. Intraoperative measurements were taken using Castroviejo caliper. A Bland-Altman analysis was performed to determine the agreement between the readings. Results: A total of 128 muscles were successfully imaged and evaluated, including 13 superior recti (10.15%), 23 inferior recti (17.96%), 35 medial recti (27.34%) and 57 lateral recti (44.53%). 124 muscles (96.9%) were within 1mm difference, which was considered clinically acceptable. Bland-Altman plots showed the level of agreement between the two methods was good. Conclusion: Anterior segment scan function of Cirrus HD-OCT 500 is an accurate method to detect the insertion of extraocular recti muscles in patients of primary strabismus surgery.

show abstract

Comparison of anterior segment optical coherence tomography and ultrasound biomicroscopy in localizing horizontal rectus muscle insertions

Duan,

Yang

2023

European Journal of Ophthalmology

View full text Add to dashboard Cite

Purpose To evaluate the viability and precision of measuring the distance from the limbus to extraocular muscle insertion using anterior segment optical coherence tomography (AS-OCT) and panoramic ultrasound biomicroscopy (UBM) before and after strabismus surgery. Methods We recruited primary strabismus patients and measured the limbus-insertion distance by AS-OCT and UBM preoperatively, 2 weeks, and 1, 3, and 6 months postoperatively. Values were also measured using callipers intraoperatively before and after the planned procedures. Preoperative AS-OCT and UBM values were compared to intraoperative calliper measurements as the gold standard. Postoperative AS-OCT and UBM values were compared to the new postoperative limbus-insertion distance. The limit of agreement deemed clinically acceptable was defined as 1 mm. Results A total of 85 horizontal muscles of 40 patients, including 48 lateral rectus muscles and 37 medial rectus muscles, were analysed. Primary muscles could be successfully detected by AS-OCT (95%) and UBM (100%). At 2 weeks and 1, 3, and 6 months postoperatively, the new rectus muscle attachment site detection rate by AS-OCT was 6%, 32%, 80%, and 89%, respectively, and that by UBM was 24%, 60%, 85%, and 93%, respectively. The Bland–Altman plots revealed better consistency in pairs of AS-OCT, UBM, and calliper measurements of primary muscles than postoperative muscles. For primary muscles, 89% of AS-OCT measurements fell within the permissible range of surgical measurements (1 mm), but this dropped to 67% at 6 months postoperatively ( P < 0.001). The accuracy of UBM measurements of primary muscles was 81%, and this decreased to 59% at 6 months postoperatively ( P = 0.001). Conclusions AS-OCT and UBM performed well in terms of imaging primary horizontal rectus muscles, but showed decreased accuracy and reproducibility in postoperative muscle measures.

show abstract

Clinical utility of anterior segment optical coherence tomography in strabismus surgery: Prospective observational study

Cited by 4 publications

References 0 publications

Shape analysis of rectus extraocular muscles with age and axial length using anterior segment optical coherence tomography

Shape analysis of rectus extraocular muscles with age and axial length using anterior segment optical coherence tomography

Accuracy of anterior segment optical coherence tomography for pre-operative localization of insertions of extraocular recti muscles

Comparison of anterior segment optical coherence tomography and ultrasound biomicroscopy in localizing horizontal rectus muscle insertions

Contact Info

Product

Resources

About