الفهرس 
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Abstract
The study of changes in choroidal thickness is a recent development, with a small number of studies suggesting postoperative changes after trabeculectomy.
Choroidal thickness is a dynamic parameter, influenced by various factors. It has been previously observed that it correlates negatively with advanced age, increased axial length, increased IOP and increased corneal thickness.
With the advent of OCT measurements of CT, we have become aware that the choroidal tissue is immediately responsive to changes in IOP and blood pressure most probably due to intravascular volume changes we aimed to evaluate choroidal thickness changes and with enhanced depth imaging-optical coherence tomography (EDI-OCT) and axial length with ophthalmic A-Scan ultrasound after reduction of intraocular pressure following trabeculectomy.
The study included 20 patients with open-angle glaucoma from the outpatient Ophthalmic Clinic of Menoufia University Hospital. The choroidal thickness was measured using enhanced depth imaging spectral domain optical coherence tomography and axial length of eye was measured using A-scan ultrasound before trabeculectomy and 1 month, 3 and 6 months postoperatively.
Statistical analysis revealed the following:
1- The mean of age was 57.20 ± 8.51 years with the range between (40 to 73) years. there were 12 males represented the large portion (60%) and 8 females represented (40%). and mean spherical equivalent (S.E ) -1.53 and ± 2.50 SD and range (-4.75 -3.00).
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2- There was highly statistically significant difference between preoperative & 3 consecutive postoperative visits as regard Iop
3- There was highly statistically significant difference between preoperative & 3 consecutive postoperative visits as regard AXL.
4- A highly statistically significant difference between preoperative & 3 consecutive postoperative visits as regard choroidal thickness.
5- There was significant positive correlation between axial length decreases and a decrease in IOP after trabeculectomy.
6- There was non-significant negative correlation between AXL decreases and an increase in CT after trabeculectomy.
7- The reduction of IOP was negatively correlated only with the increase in nasal, temporal, inferior and superior CT 3mm away from the fovea. While, there was insignificant negative correlation with SFCT-H and SFCT-V.
Recommended to do this study on large number of patients to support our results and to take in consideration the long follow up more than 6 months to prove our results.