RESUMEN
PURPOSE: The purpose of this study was to correlate between the axial length of the globe and the insertion site of horizontal extraocular muscles using swept-source anterior segment optical coherence tomography (SS-ASOCT), with posing an equation to calculate the muscle insertion site from the axial length. METHODS: The study design was observational and cross-sectional. It was performed on 157 eyes of 157 healthy subjects. The distance of the medial rectus (MR) and the lateral rectus (LR) insertion sites from the limbus were measured using SS-ASOCT. The insertion sites' distances were correlated to the axial length (hypermetropes < 22.5 mm, myopes > 24.5). Correlation between numerical variables was done by Pearson's correlation coefficient and confirmed by linear regression analysis and scatter diagrams. RESULTS: The mean MR insertion site was 5.47 ± 0.19 mm in hypermetropes versus 5.68 ± 0.23 mm in myopes, whereas the mean LR insertion site was 6.81± 0.23 mm in hyperopes versus 7.08 ± 0.16 mm in myopes. The axial length showed a moderate positive, but significant, correlation to the insertional position for the medial and lateral rectus muscles (MR: r=0.417, p<0.001; LR: r=0.410, p<0.001). CONCLUSION: Comparing the horizontal extraocular muscle insertion site to axial length using SS-ASOCT showed a significant positive correlation. The model equation for MR insertion: MR (mm) = 4.522 + 0.045 (AXL in mm) with an R = 0.437, R2= 0.191, F=12.071, P<0.001. The model equation for LR insertion: LR (mm) = 5.72 + 0.048 (AXL in mm) with an R = 0.438, R2= 0.192, F=12.116, P<0.001.
RESUMEN
PURPOSE:: To evaluate the use of intraocular injection of triamcinolone acetonide in pediatric cataract surgery with or without intraocular lens implantation as a vitreous dye to ensure a complete anterior vitrectomy and evaluate its effect on postoperative ocular inflammation, infection, posterior capsule opacification, and intraocular pressure. METHODS:: Randomized controlled trial included children diagnosed with bilateral congenital cataract in both eyes. Their eyes were randomly assigned into two groups: group A underwent aspiration, posterior capsulotomy, and anterior vitrectomy with intraocular injection of triamcinolone acetonide, while group B underwent the same surgical procedure without intraocular injection of triamcinolone acetonide. Intraocular pressure, postoperative inflammation, infection, and posterior capsule opacification were followed up till 6 months. RESULTS:: The study comprised 44 eyes of 22 children. The mean age was 2.4 ± 2.1 years including 10 males and 12 females. The mean postoperative intraocular pressure was within normal range in both groups. No case of infection in both groups. No eyes in group A showed reaction, while in group B, three eyes showed exudate on the first day, which improved at 2 weeks. Posterior synechiae was recorded in four eyes in group A and in five eyes in group B. Posterior capsule opacification was noted in one eye in group A at 3 month, while it was noted in nine eyes in group B. The difference was statistically significant ( p = 0.004). CONCLUSION:: Triamcinolone acetonide was found to be useful in better visualization of vitreous in pediatric cataract surgery and has good effect in decreasing postoperative inflammation and posterior capsule opacification.
