Post‐trabeculectomy ocular biometric changes

Pakravan, Mohammad; Alvani, Azam; Esfandiari, Hamed; Ghahari, Elham; Yaseri, Mehdi

doi:10.1111/cxo.12477

Cited by 21 publications

(19 citation statements)

References 45 publications

(113 reference statements)

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“…The AL would stabilize almost 3 months after the trabeculectomy. 10 This is in good agreement with the data of this study although the association between changes in IOP and AL was not significant. The reduction of 0.14 mm in AL after 3 months of AGV implantation is consistent with the study of Francis et al 6 on AL following Baerveldt tube implantation.…”

Section: Discussionsupporting

confidence: 92%

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Ocular biometric changes after Ahmed glaucoma valve implantation

Miraftabi

Lotfi

Nilforushan

et al. 2019

European Journal of Ophthalmology

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Purpose: To investigate the ocular biometric changes after uneventful Ahmed glaucoma valve implantation. Methods: Patients with refractory glaucoma who were candidate for Ahmed valve surgery were prospectively included in this study. Patients with a history of any kinds of corneal surgery were excluded. Refractive status, intraocular pressure, axial length, anterior chamber parameters including anterior and posterior mean keratometry, central corneal thicknesses, and anterior chamber depth, anterior chamber volume, and anterior chamber angle were evaluated at baseline and 1 and 3 months after surgery. Results: A total of 20 eyes from 20 patients were included. Mean intraocular pressure at baseline was 33.4 ± 12.3 mm Hg that significantly decreased to 14.6 ± 6.2 mm Hg at 1 month and 13.5 ± 4.3 mm Hg at 3 months after Ahmed glaucoma valve implantation ( p < 0.001). Mean number of medications was 3.6 ± 1.3 at baseline which significantly decreased to 1.0 ± 1.3 at 3 months after Ahmed glaucoma valve implantation ( p < 0.001). Axial length decreased significantly from 23.69 ± 1.95 to 23.47 ± 1.91 mm ( p < 0.001) at month 3. There were no significant changes in other parameters such as mean spherical equivalent, anterior chamber volume, anterior chamber angle, anterior chamber depth, and keratometry at the end of month 3 after surgery ( p > 0.05 in all). Conclusion: Ahmed glaucoma valve implantation had a significant effect on axial length at 3 months after surgery but its effect on keratometry and other anterior chamber parameters was not significant.

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Section: Discussionsupporting

confidence: 92%

“…5,9 A total reduction of 0.1–0.9 mm in AL after trabeculectomy has been reported. 10 In a study by Husain et al, 5 each 1 mm Hg decrease in IOP led to a 0.01 mm reduction in AL in patients with primary open angle glaucoma. The AL would stabilize almost 3 months after the trabeculectomy.…”

Section: Discussionmentioning

confidence: 96%

Ocular biometric changes after Ahmed glaucoma valve implantation

Miraftabi

Lotfi

Nilforushan

et al. 2019

European Journal of Ophthalmology

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“…Because MIGS surgeries use the pre-existing clear corneal wound used for phacoemulsification, they should not add any induced astigmatism beyond what is already induced by the cataract extraction itself. This is in contrast to trabeculectomy, which increases with-the-rule astigmatism over time [24, 25].…”

Section: Discussionmentioning

confidence: 99%

Refractive outcomes among glaucoma patients undergoing phacoemulsification cataract extraction with and without Kahook Dual Blade goniotomy

et al. 2019

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Background Glaucoma patients undergoing phacoemulsification alone have a higher rate of refractive surprise compared to patients without glaucoma. This risk is further increased with combined filtering procedures. Indeed, there are few and conflicting reports on the effect of combined phacoemulsification and micro-invasive glaucoma surgery (MIGS). Here, we look at refractive outcomes of glaucoma patients undergoing phacoemulsification with and without Kahook Dual Blade (KDB) goniotomy. Methods Retrospective chart review of 385 glaucomatous eyes of 281 patients, which underwent either phacoemulsification alone (n = 309) or phacoemulsification with KDB goniotomy (n = 76, phaco-KDB) at the University of Colorado. The main outcome was refractive surprise defined as the difference in target and postoperative refraction spherical equivalent greater than ±0.5 Diopter (D). Results Refractive surprise greater than ±0.5 D occurred in 26.3% of eyes in the phaco-KDB group and 36.2% in the phacoemulsification group (p = 0.11). Refractive surprise greater than ±1.0 D occurred in 6.6% for the phaco-KDB group and 9.7% for the phacoemulsification group (p = 0.08). There was no significant difference in risk of refractive surprise when pre-operative IOP, axial length, keratometry or performance of KDB goniotomy were assessed in univariate analyses. Conclusion There was no difference between refractive outcomes of glaucomatous patients undergoing phacoemulsification with or without KDB goniotomy.

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“…In a study by Husain et al [20], each 1 mmHg decrease in IOP led to a 0.01 mm AL reduction in POAG. Patients with OAG are more sensitive to AL changes and experience more axial fluctuations during the first three months after trabeculectomy compared to patients with angle closure glaucoma [6,28]. Some authors suggest that AL reduction can be predicted after three months by formula: AL reduction (mm) = -199 + 0.006 × IOP reduction + 0.008 × final IOP [23,29].…”

Section: Discussionmentioning

confidence: 99%

“…This error was to 0.18 diopter in a very long eye (30 mm) and increases to 0.38 diopter in very short eye (20 mm). Other parameter, ACD change of 0.12 mm would result in a change of 0.06 diopter in refractive error for posterior chamber IOL [5,6,[28][29][30][31].…”

Section: Discussionmentioning

confidence: 99%

Ocular biometric changes after trabeculectomy

Radenković¹,

Stanković-Babić²,

Djordjević-Jocić³

et al. 2019

Srp Arh Celok Lek

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Introduction/Objective Trabeculectomy is a conventional filtration procedure in surgical glaucoma treatment. Even after successful trabeculectomy, the patient's visual acuity can be reduced. Studies (1991) showed that changes in visual acuity occur due to changes of corneal curvature and anterior chamber depth. Anterior chamber depth change for 1 mm results in about 2 diopters change in refractive sphere. Simultaneous with anterior segment changes, anti-glaucoma surgery effect can also be manifested in posterior segment of the eye: choroidal thickness, axial length and the ocular perfusion. Axial length reduction after trabeculectomy was supposed according to biometry, more pronounced if intraocular pressure is higher preoperatively, or in the first postoperative week with spontaneous recovery to preoperative values one year after surgery. A study was conducted at the Clinic for Eye Diseases in Niš to determine the difference in pre/post-operative values of biometry on 60 patients with glaucoma. Methods In this study we used retrospective-prospective biometric analysis in patients with open-angle glaucoma. Results Anterior chamber depth was significantly different during the observed period, for 1.1 mm in first week (p < 0.0001) in the whole group and glaucoma type. The mean axial length varies considerably during the observed period, shorter for 0.39 mm in first week (p < 0.05). Conclusion By analyzing biometric parameters, a postoperative difference of biometry with spontaneous recovery was determined. There is a difference in postoperative visual acuity of patients compared to preoperative, with spontaneous recovery at the end of the follow-up.

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Post‐trabeculectomy ocular biometric changes

Cited by 21 publications

References 45 publications

Ocular biometric changes after Ahmed glaucoma valve implantation

Ocular biometric changes after Ahmed glaucoma valve implantation

Refractive outcomes among glaucoma patients undergoing phacoemulsification cataract extraction with and without Kahook Dual Blade goniotomy

Ocular biometric changes after trabeculectomy

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