Silicone Oil-filled Eyes Research Articles

Development and Verification of an Adjustment Factor for Determining the Axial Length Using Optical Biometry in Silicone Oil-Filled Eyes.

The aim of this prospective clinical study was to establish and verify an adaptation for axial length (AL) measurement in silicone oil (SO)-filled pseudophakic eyes with a Scheimpflug and partial coherence interferometry (PCI)-based biometer. The AL was measured with a Pentacam AXL (OCULUS Optikgeräte GmbH, Wetzler, Germany) and IOLMaster 700 (Carl Zeiss Meditec, Jena, Germany). The coefficients of variation (CoV) and the mean systematic difference (95% confidence interval (CI)) between the devices were calculated. After implementing a setting for measuring AL in tamponaded eyes with a Pentacam based on data of 29 eyes, another 12 eyes were examined for verification. The mean AL obtained with the Pentacam was 25.53 ± 1.94 mm (range: 21.70 to 30.76 mm), and with IOLMaster, 24.73 ± 1.97 mm (ranged 20.84 to 29.92 mm), resulting in a mean offset of 0.80 ± 0.08 mm (95% CI: 0.77, 0.83 mm), p < 0.001. The AL values of both devices showed a strong linear correlation (r = 0.999). Verification data confirmed good agreement, with a statistically and clinically non-significant mean difference of 0.02 ± 0.04 (95% CI: −0.01, 0.05) mm, p = 0.134. We implemented a specific adaptation for obtaining reliable AL values in SO-filled eyes with the Pentacam AXL.

“Inert” cotton fibers – Gossypiboma in silicone oil-filled eyes

Retained cotton fibers (gossypiboma) are known following anterior segment surgeries. There is only one case report of pre retinal gossypiboma (retained cotton fibers; RCF) following pars plana vitrectomy (PPV) with silicone oil tamponade (SOI) for proliferative diabetic retinopathy. It was associated with dense exudation surrounding it. We report three cases (two retrolental and one preretinal) of inert RCF (gossypiboma), following PPV-SOI for rhegmatogenous retinal detachment.

Differences in Axial Length and IOL Power Based on Alternative A-Scan or Fellow-Eye Biometry in Macula-Off Rhegmatogenous Retinal Detachment Eyes.

IntroductionThis study was performed to observe the potential refractive prediction error based on alternative A-scan ultrasound and fellow-eye biometry for phacovitrectomy in macula-off rhegmatogenous retinal detachment (RRD) eyes.MethodsPhakic macula-off RRD eyes without axial length (AL) measurements obtained using IOLMaster were included. Vitrectomy without lens extraction was performed for RRD repair. Preoperative AL was measured using alternative A-scan ultrasound (AL-US). Postoperative AL was obtained in eyes with silicone oil tamponade (AL-SO) and preoperative fellow-eye biometry (AL-FE) using IOLMaster. Other eyes that faced the same preoperative situation but underwent phacovitrectomy based on fellow-eye biometry were recruited as controls.ResultsAL-US, AL–FE, and AL-SO were 25.39 ± 2.14 mm, 25.85 ± 2.16 mm and 26.08 ± 2.53 mm, respectively. The Bland–Altman agreement among AL-US, AL-FE and AL-SO was good (95.5%, 21/22 of cases were in the LoA). The mean IOL power calculated using AL-US (Power-US), AL-FE (Power-FE) and AL-SO (Power-SO) was 16.81 ± 7.19 D, 14.74 ± 6.95 D and 13.54 ± 8.32 D, respectively. The difference between AL-US and AL-SO was significant (P < 0.05), while that between AL-FE and AL-SO was not (P > 0.05). The difference between Power-US and Power-SO was significant (P < 0.05), while that between Power-FE and Power-SO was not (P > 0.05). Nine eyes underwent phacovitrectomy based on fellow-eye biometry and had a final postoperative myopic shift of 0.64 ± 0.78 D.ConclusionsAlternative A-scan ultrasound led to a significant difference in AL and a prediction error in IOL power, while fellow-eye biometry provided similar results to silicone oil-filled eyes after RRD repair.

Pharmacokinetics of Intravitreal Vancomycin and Ceftazidime in Silicone Oil-Filled Macaque Eyes.

PurposeThis study evaluated the pharmacokinetics of intravitreal vancomycin and ceftazidime in the aqueous humor of macaque eyes filled with silicone oil in the vitreous cavity.MethodsIntravitreal vancomycin (1 mg/0.1 mL) and ceftazidime (2 mg/0.1 mL) were injected into four normal macaque eyes, four vitrectomized aphakic macaque eyes, and four previously vitrectomized aphakic macaque eyes filled with silicone oil (silicone oil-filled eyes). Aqueous humor samples (0.1 mL) were obtained just before injection and at 2 and 5 hours and 1, 2, 3, 5, 7, and 10 days after injection. In each group, corneal endothelial cell density (ECD) measurements and electroretinogram (ERG) recordings were obtained before injection and after 1 month.ResultsThe half-lives of vancomycin in the aqueous humor of normal, vitrectomized, and silicone oil-filled eyes were 29.4, 21.1, and 6.8 hours, respectively, and those of ceftazidime were 20.4, 5.2, and 3.1 hours, respectively. The maximum vancomycin aqueous humor concentrations of normal, vitrectomized, and silicone oil-filled eyes were 151.4, 205.6, and 543.5 µg/mL, respectively, and the maximum ceftazidime aqueous humor concentrations are 64.6, 260.0, and 1176.3 µg/mL, respectively. There was no change in ECD, and ERG was not declined after intravitreal injection in all groups.ConclusionsThe half-lives of vancomycin and ceftazidime in the aqueous humor were shorter in silicone oil-filled eyes than in normal and vitrectomized eyes. High antibiotic concentrations in silicone oil-filled eyes seemed to be well tolerated.Translational RelevanceThis study aids in estimating how often an antibiotic should be intravitreally injected for endophthalmitis of silicone oil-filled eyes.

Mechanism and prognostic indicators for explosion-related eye trauma: eye injury vitrectomy study.

To explore the clinical features, surgical interventions and prognosis of injured eyes following explosion and to develop the risk factors for poor prognosis. A nested case-control study. To the date of 31 December 2018, 99 explosion-related eye globes were selected from the Eye Injury Vitrectomy Study database, which is a multicenter prospective cohort study and began in 1990s. All cases selected underwent vitreoretinal surgery or enucleation and were followed up for at least 6months. Clinically meaningful preoperative variables and outcomes were used to develop logistic regression models. The unfavourable outcomes were defined as silicone oil-filled eyes, phthisis bulbi, enucleation and anatomically restored eyes whose final BCVA is worse than initial vision after 6months of follow-up. The proportion of unfavourable outcomes was 92.0%, 60.9% and 66.7% in large festive fireworks, detonator and beer bottle groups respective. The anatomic and visual outcome of injured eyes with combined injury of blast wave and projectile were worse than that of ruptured eyes (Fisher's exact=0.041). The extrusion of iris/lens (OR=3.20, p=0.015), PVR-C (OR=6.08, p=0.036) and choroid damage (OR=5.84, p=0.025) is independent risk factors of unfavourable prognosis for explosion-related eye trauma. The extrusion of iris/lens, PVR-C and choroid damage is the independent risk factors for unfavourable outcomes in explosion-related eye trauma. There is a unique injury mechanism in explosion-related eye trauma. Through the nested case-control study, the extrusion of iris/lens, PVR-C, and choroid damage are the independent risk factors for unfavorable outcomes in explosion-related eye trauma. The mechanism of open globe mixture and close globe mixture in explosion-related eye trauma need more cases and participating units to explore together in the future.

Accuracy of new-generation intraocular lens calculation formulas in eyes undergoing combined silicone oil removal and cataract surgery.

To compare the performance of new-generation and traditional intraocular lens (IOL) calculation formulas in eyes undergoing combined silicone oil (SO) removal and cataract surgery and to evaluate the prediction accuracy of Wang-Koch (WK) adjustment in SO-filled long eyes. Zhongshan Ophthalmic Center, Sun Yat-sen University, Guangzhou, China. Retrospective consecutive case-series study. New-generation formulas (Barrett Universal II, Emmetropia Verifying Optical, Kane, and Ladas Super formulas) and traditional formulas (Haigis, Hoffer Q, Holladay 1, and SRK/T formulas) were compared. The performance of WK adjustment was assessed in eyes with axial length more than 26 mm. The median absolute error (MedAE) was the main parameter to evaluate the accuracy of formulas. A total of 211 participants (211 eyes) who underwent combined SO removal and phacoemulsification with IOL implantation were included. Four new-generation formulas displayed statistically significant lower MedAE (0.32 to 0.35 diopter [D]) and higher percentage of eyes within ±1.00 D of prediction error (85.31% to 87.20%) compared with those of the traditional formulas (MedAE: 0.39 to 0.50 D; ±1.00 D: 81.04% to 81.99%, P < .05). For SO-filled long eyes, all traditional formulas showed hyperopic bias (0.36 to 0.65 D, P < .05), except for Haigis formula (0.28 D, P = .083), and this bias could be corrected by WK adjustment (P > .05). EVO formula displayed the lowest MedAE both in total (0.32 D) and in long eyes (0.33 D). New-generation formulas and traditional formulas with WK adjustment showed satisfactory prediction accuracy in eyes undergoing combined SO removal and cataract surgery. EVO formula displayed the highest accuracy.

Large Retinectomies for Retinal Detachment Complicated by Proliferative Vitreoretinopathy: Anatomical and Functional Outcome of Silicone Oil versus Perfluoropropane Gas.

PurposeTo assess the anatomic and functional outcomes of eyes undergoing vitrectomy and large retinectomy for the management of retinal detachment (RD) complicated by advanced proliferative vitreoretinopathy (PVR).MethodsA total of 66 eyes of 63 patients with RD complicated by PVR were treated with vitrectomy and 180° or more retinectomy and silicone oil (n=46) or perfluoropropane gas (n=20) were used as intraocular tamponades.ResultsRetinal reattachment was achieved in 89.39% (59 eyes) of the cases. The mean follow-up was 33.7 months (range 12–76 months). In gas-filled eyes, the final anatomic success rate was 85% (17 eyes) and in silicone oil-filled eyes was 91.3% (42 eyes) (p=0.46). After the initial retinectomy, the total anatomic success rate was 80.3% (53/66 eyes), 70% in gas-filled eyes (14/20 eyes) and 84.79% in silicone oil-filled eyes (39/46 eyes) (p=0.19). Visual acuity (VA) improved in 37 (56.06%) eyes, remained the same in 19 (28.78%) eyes and became worse in 10 (15.15%) cases. Best corrected VA was ≥20/200 in 22 eyes 33.33%. The final VA was associated with the preoperative VA (r=0.68), the preoperative status of the macula influence significantly the final visual acuity (p<0.0001) and there is statistically significant difference in the final visual acuity between eyes with and without anatomic success (p<0.05).ConclusionThe large circumferential retinectomies can be beneficial in eyes with RD complicated by advanced PVR. No significant difference was found in anatomic success rate, and rate of complications between eyes with silicone oil tamponade and long acting gas undergoing large retinectomy. Regarding the final BCVA, slight difference was found in favor of gas-filled eyes.

Optical coherence tomography study of macular structural changes in silicone oil-filled eyes

Introduction Silicone oil (SO) has been used in complex cases of retinal detachment with proliferative vitreoretinopathy (PVR), giant retinal tear, and traumatic cases. This study aimed to assess macular structural changes in SO filled eyes after pars plana vitrectomy (PPV) for rhegmatogenous retinal detachment with PVR. Patients and methods This is a prospective interventional study that was conducted on 60 SO-filled eyes after successful PPV for rhegmatogenous retinal detachment with grade C PVR; SO was left in all eyes for a duration of 3 months. Thorough ophthalmic evaluation in Ophthalmology Department, Tanta University, Egypt was performed including best corrected visual acuity (BCVA), fundus examination, and anterior segment examination. Optical coherence tomography was done for all patients at presentation to assess the macular area. Results Epiretinal membrane (ERM) was detected in 14 (23.3%) eyes, cystoid macular edema (CME) in 21 (35%) eyes, photoreceptor disruption in 21 (35%) eyes, macular hole in one (1.7%) eye, and foveal thinning in 18 (30%) eyes. The BCVA was positively correlated with the presence of ERM, CME, and photoreceptor disruption and the results were statistically significant with ERM and photoreceptor nonintegrity with P values of 0.049 and 0.001 respectively. In addition, there is no significant correlation between changes in central retinal thickness and BCVA. Conclusion Visual loss after successful PPV in SO filled eyes can occur due to macular changes like CME, ERM, photoreceptor disruption, foveal thinning, and macular hole.

Factors of Retinal Re-detachment and Visual Outcome after Intraocular Silicone Oil Removal in Silicone Oil-filled Eyes

ABSTRACTBackground: This study aims to evaluate the risk factors of retinal re-detachment and visual outcome after silicone oil removal (SOR) in silicone oil-filled eyes.Methods: A total of 57 patients who underwent pars plana vitrectomy (PPV) and silicone oil injection for retinal detachment (RD), and subsequently underwent a silicone oil removal procedure. Pre-operative examinations were performed to determine the best-corrected visual acuity (BCVA) using the Snellen chart, while Icare was used to determine the intraocular pressure (IOP). In addition, slit-lamp examination of the anterior segment and lens, fundus pre-set lens examination for the posterior segment, color fundus photography, anterior segment photography and type B-ultrasonic scans were performed.Results: In five of 57 patients (8.77%), the retina re-detached following the removal of silicone oil. The factors for re-detachment were proliferative vitreoretinopathy (PVR) (two cases), the formation of new retinal breaks (two cases), and incomplete membrane peeling (one case). The rate of retinal re-detachment (reRD) was statistically independent of the duration of silicone oil endotamponade (P = .810). BCVA significantly improved following the removal of silicone oil (P = .001). The duration of the silicone oil tamponade was significant in the development of cataract (27 eyes, 47.3%; P = .0008), emulsified oil in the anterior chamber (13 eyes, 22.8%; P = .009), and glaucoma (seven eyes, 12.2%).Conclusion: The improvement of visual acuity was discovered following the removal of the intraocular silicone oil. Although the duration of the intraocular silicone oil endotamponade had no effect on the rate of retinal attachment, a longer duration of silicone oil endotamponade can lead to the development of complications, such as cataract, emulsified oil in the anterior chamber and glaucoma, suggesting that the earlier removal of oil should be performed.

Antibiotics and antifungals in silicone oil

BackgroundAntimicrobials may be injected into silicone oil-filled eyes with endophthalmitis, but the interaction with oil is unclear. The purpose of the experiment is to determine whether vancomycin, amikacin, and amphotericin B mix with silicone oil.MethodsUsing the relative proportions of the human eye, 4 ml of 1000 centistokes silicone oil was centrifuged with 0.1 ml of vancomycin 1 mg/0.1 ml, amikacin 0.4 mg/0.1 ml, or amphotericin B 5 µg/0.1 ml in vitro and eluted. The aqueous was immediately analyzed with a liquid chromatographer/mass spectrometer and after 24 h.ResultsWithin 24 h, a mean of 26.9 μmol/L of vancomycin, 0 nmol/L of amikacin, and 0 nmol/L of amphotericin B were recovered. When the concentrations of amikacin and amphotericin B were increased 100-fold, 0 nmol/L of amikacin and 75.7 µmol/L of amphotericin B were recovered.ConclusionsVancomycin and amphotericin B partially mixed with the silicone oil. Amikacin was not recovered from the antibiotic–silicone oil mixture.

Trocar opening: silicone oil removal with phacoemulsification and intraocular lens implantation.

To evaluate the efficacy and safety of a modified technique [trocar opening (TO)] for silicone oil removal (SOR) in combination with phacoemulsification and intraocular lens (IOL) implantation. A total of 60 eyes of 60 patients with cataract and silicone oil-filled eyes were enrolled in this study. The patients were divided into two groups: the patients in the control group underwent 23-gauge pars plana active SOR surgery with phacoemulsification and IOL implantation, while the patients in the TO group underwent TO methods during surgery. Best corrected visual acuity (BCVA), surgery time, intraocular pressure, and operative complications were observed 6mo after surgery. There was no significant difference between the two groups in terms of age, gender, preoperative, intraocular pressure, or time of silicone oil stay. Prior to surgery, the mean BCVA for the control and TO groups was 1.34±0.44 and 1.36±0.42. At 6mo following surgery, the mean BCVA improved to 0.74±0.36 and 0.77±0.32, respectively (P<0.001). There was no significant difference between the two groups. The mean SOR time was 6.9±2.3min and 4.8±1.2min in the control and TO groups (P=0.008). The total operation time was 28.2±8.5min and 24.6±6.4min, respectively (P=0.035). Posterior capsule rupture occurred in four eyes of control and none of TO group (P<0.01). Late recurrent retinal detachment occurred in one eye in the control group (2mo after surgery) and in one eye in the TO group (4mo after surgery). TO is a simple, effective, time-saving, and safe method for SOR combined with phacoemulsification and IOL implantation.

Repeated Injection of Methotrexate into Silicone Oil-Filled Eyes for Grade C Proliferative Vitreoretinopathy: A Pilot Study

Purpose: To evaluate the effects of repeated intra-silicone oil (SO) injections of methotrexate (MTX) on the outcomes of surgery for rhegmatogenous retinal detachment (RRD) with grade C proliferative vitreoretinopathy (PVR-C). Methods: In this prospective pilot case series, eyes with RRD and PVR-C underwent pars plana vitrectomy and intraocular injection of SO. At the conclusion of the procedure, 250 µg of MTX was injected into the SO-filled vitreous cavity. Intra-SO injection was repeated at weeks 3 and 6; the minimum follow-up period was 6 months. The main outcome measure was retinal reattachment rate. Results: Eleven eyes of 11 patients (mean age, 52.73 ± 18.01 years) were included. The mean follow-up period was 9 ± 3 months (range, 6–15 months). Total retinal detachment with anterior and/or posterior PVR-C was present in all eyes before surgery. Mean preoperative best-corrected visual acuity (BCVA) was 2.62 ± 0.04 logMAR. All operated eyes exhibited retinal reattachment posterior to the equator during the follow-up period. Mean postoperative BCVA was significantly improved to 1.02 ± 0.51 logMAR (p = 0.003). No ocular or systemic side effects were observed. Conclusion: Repeated intra-SO injection of MTX as an adjunctive therapy for RRD complicated by PVR showed promising results and was not associated with adverse effects. Further studies are needed to confirm its possible beneficial effects on the final anatomic and functional outcomes in these cases.

Causes and the efficacy of treatment of retinal detachment in silicone oil-filled eyes

Objective To analyze the causes and the efficacy of retinal detachment in silicone oil-filled eyes. Methods The clinical data of 70 silicone oil-filled eyes of 70 cases of retinal detachment from Jan. 2017 to Jun. 2018 were collected and analyzed retrospectively. The causes of retinal detachment in silicone oil-filled eyes were observed. Results There were 3 kinds of causes of retinal detachment in silicone oil-filled eyes: subretinal effusion with retinal detachment in 10 eyes (14.29%); poor closure of primary tear or formation of new tear in 13 eyes (18.57%); the progress of proliferative vitreoretinopathy (PVR) in 47 eyes (67.14%). The retinas of all cases were reattached after retinal reconstructive surgery. Visual acuity after second surgery improved in 60 eyes (85.71%), unchanged in 9 eyes (12.86%), decreased in 1 eye (1.43%). The average visual acuity after second surgery were better than that before surgery (t=8.316, P=0.000). Conclusion The retinal detachment in silicone oil-filled eyes is mainly caused by progress of PVR, followed by the poor closure of primary tear, the formation of new tear and the formation of subretinal effusion. Retinal reattachment surgery for the treatment of retinal detachment in silicone oil-filled eyes is effective. Key words: Detachment, retinal; Causes; Efficacy, treatment

Accuracy of Refractive Outcome Using Optical Low Coherence Reflectometry in Silicone Oil-Filled Eyes Undergoing Intraocular Lens Implantation with Silicone Oil Removal

Aim: To assess the accuracy and consistency of intraocular lens (IOL) power calculation using optical low coherence reflectometry device (OLCR), LENSTAR LS-900, in silicone oil-filled eyes undergoing combined IOL implantation and silicone oil removal (SOR). Setting: Sankara Eye Hospital, Bangalore, Karnataka, India. Design: Retrospective study. Method: This study comprised 49 silicone oil-filled eyes of 47 patients who underwent combined IOL implantation with SOR. All patients were measured with OLCR before performing phacoemulsification and IOL implantation in silicone oil mode. The predicted refraction as calculated with OLCR was correlated with the postoperative spherical equivalent. Results: The mean deviation of the spherical equivalent was −0.74 diopters (D). The mean difference between predicted refraction and postoperative spherical equivalent was −0.34 D. The mean axial length of the eyes was 23.53+1.86 (range 21.49–30.03 mm). Conclusion: OLCR is a safe device that provides precise biometry and accurate IOL power calculation in silicone oil-filled eyes.

Keratoprostheses in silicone oil-filled eyes: long-term outcomes.

To analyse the functional and anatomical outcomes of different types of keratoprostheses ineyes with retained silicone oil following vitreoretinal surgery. Retrospective chart review of patients operated with any type of permanent keratoprosthesis (Kpro) in silicone oil-filled eyes between March 2003 and June 2017 were analysed. 40 silicone oil-filled eyes underwent keratoprostheses, of which 22 were type 1 and 18 were type 2 Kpros (Lucia variant-nine, modified osteo odonto kerato prosthesis (MOOKP)-four, Boston type 2-three and osteoKpro-two) with a mean follow-up of 61.54 , 42.77, 45.25 , 25 and 37 months, respectively. Anatomic retention of the primary Kpro was noted in 33 eyes (82.5%). A best-corrected visual acuity of better than 20/200 and 20/400 was achieved in 26 (65%)+32 (80%) eyes. Retroprosthetic membrane (RPM) was the most common complication noted in 17 eyes (42.5%). Perioptic graft melt was noted in 4 of 22 eyes of the type 1 Kpro (2 (10.5%) without associated ocular surface disorder (OSD)) and in 1 eye each of Boston and Lucia type 2 Kpro. Laminar resorption occurred in one eye each of the MOOKP and OKP groups. Endophthalmitis and glaucoma did not occur in any eye. Appropriately chosen keratoprosthesis is a viable option for visual rehabilitation in eyes post vitreoretinal surgery with retained silicone oil-induced keratopathy not amenable to conventional penetrating keratoplasty. Kpro melt among type 1 Kpro did not occur in 89.5% eyes without associated OSD (19 of 22 eyes), despite the lack of aqueous humour and presence of RPM (4 eyes), two factors considered to play a significant role in the causation of sterile melts. Of interest to note was the absence of infection in any of these eyes. The possible protective role of oil from endophthalmitis is interesting, though yet to be ascertained.

Trocar Opening: A Novel Management Strategy for Silicone Oil Removal with Phacoemulsification and Iol Implantation

Objective: To evaluate the efficacy and safety of a novel management strategy (Trocar opening) in silicone oil removal (SOR) in combination with phacoemulsification and IOL implantation. Methods: There were 60 eyes of 60 patients with cataract and silicone oil-filled eyes enrolled in this study. All of the patients were divided into two groups: the patients in control group received 23G pars plana active SOR surgery with phacoemulsification and IOL implantation, while the patients in TO group received trocar opening methods during surgery. Best corrected visual acuity (BCVA), surgery time; intraocular pressure (IOP) and operative complications were observed in six months after surgery. Results: There was no significant difference between the 2 groups for age, gender, preoperative, IOP or time of silicone oil stay. All patients were successfully completed their surgery. At 6 month after surgery, the mean BCVA improved from 1.34 ± 0.44 (control group) and 1.36 ± 0.42 (TO group) before surgery to 0.74 ± 0.36 (control group) and 0.77 ± 0.32 (TO group) after surgery (P<0.001), respectively, and there was no significant difference between the 2 groups. The mean SOR time was 6.9 ± 2.3 min in control group, while 4.8 ± 1.2 min in TO group (P=0.008). The mean cataract time was 8.4 ± 3.2 in control group, while 7.2 ± 2.6 min in TO group (P=0.013). The total operation time was 28.2 ± 8.5 min in control group, and 24.6 ± 6.4 min in TO group (P=0.035). Four eyes experienced posterior capsule rupture in control group, while none in TO group (P0.01). There was 1 eye occurred late recurrent retinal detachment 2 months after surgery in control group and 1 eye 4 mo in TO group. No other postoperative complication was observed such as vitreous hemorrhage, dislocated IOL, or endophthalmitis. Conclusion: Our finding indicates that trocar opening is a simple, effective, time saving and safe method for SOR combined with phacoemulsification and IOL implantation.

The comparison of immersion B-scan guided with respective sonic velocity and Lenstar LS900 onmeasurement of axial length in silicone oil-filled eyes

Objective To evaluate the accuracy of the biometry using immersion B scan and partial coherence interferometry (Lenstar LS900) for the axial length (AL) of silicone oil-filled eyes respectively. Methods Thirty-five silicone oil-filled eyes (38 patients) were included in the study. All of these eyes underwent silicone oil removal, cataract extraction and intraocular lenses implantation. The AL of all the silicone oil-filled eyes was measured with A/B-scan ultrasound and Lenstar LS900 before operation and with Lenstar LS900 after operation. The measured distance was compared respectively. The method of immersion B-scan guided with respective sonic velocity. AL was the sum of corneal thickness, anterior chamber depth, lens thickness, the apparent length of oil bubble (velocity values 996 m/s), the depth of the water layer beneath the oil bubble. Results Thirty-one eyes were measured with Lenstar LS900 before silicone oil removal, and the mean AL was (24.12±1.70) mm, 7 eyes failed to get the results before the operation; 36 eyes were measured with Lenstar LS900 after silicone oil removal, and the mean AL was (24.45±1.89) mm. All eyes were measured with B-scan before silicone oil removal, and the mean AL was (24.87±2.52) mm. The difference (31 eyes) of AL measurement before silicone oil removal by two methods was (−0.00±0.09) mm; the difference (31 eyes) between pre- and post-surgical AL measurement with Lenstar LS900 was (0.02±0.07) mm; the difference (36 eyes) between pre-surgical AL measured with B-scan and post-surgical AL measured with Lenstar LS900 was (−0.02±0.11) mm. All the differences were not statistically significant (t=−0.205, 1.752, −1.280; P>0.05). The consistency of the results measured by two methods was well in Bland-Ahamn analysis. Conclusions Measurement results of AL between immersion B-scan guided with respective sonic velocity and Lenstar LS900 are high repeatability on silicone oil-filled eyes. The AL of silicone oil-filled eyes can be measured reliably by immersion B-scan guided with respective sonic velocity. Key words: Axial length, eye; Silicone Oils; Ultrasonography/methods

Phacoemulsification combined with transpupillary removal of silicone oil and intracapsular intraocular lens implantation

To estimate the effectiveness of phacoemulsification and foldable intraocular lens (IOL) implantation combined with transpupillary silicone oil removal. There were 168 eyes of 168 candidate patients with cataract and silicone oil-filled eyes recruited in our study. All of the patients received the intraocular silicone oil removal surgery by transpupillary drainage and cataract extraction by phacoemulsification. Then the IOL implantation were also performed through corneal incision. The surgery was successfully completed in all eyes. Best corrected visual acuity (BCVA) and postoperative complications were recorded in three months after surgery. There were 143 eyes with BCVA improved, otherwise 25 eyes remained stable at the last follow-up visit. The mean BCVA statistically improved from 20/400±0.02 to 20/100±0.15 (P<0.001) and mean postoperative IOP was 13.85±2.18 mm Hg (P=0.415). No intra-operative complications were reported. Phacoemulsification combined with transpupillary removal of silicone oil is a safe and simple effective method. In general, it enables quick recovery of visual acuity with less complication rate.

Recurrent retinal detachment in silicone oil-filled eyes treated with two-port 27-gauge pars plana vitrectomy

Recurrent retinal detachment in silicone oil-filled eyes treated with two-port 27-gauge pars plana vitrectomy

Axial Eye Length Assessment in Silicone Oil-Filled Eyes

Purpose: to compare the reliability of axial eye length (AEL) measurement in silicone oil-filled phakic eyes by conventional B-scan ultrasonography through the eyelid, after a correcting factor,to partial coherence interferometry (PCI) measurement. Methods: a prospective and comparative study was performed at Al-Zahraa University Hospital clinic from (January 2016 - December 2016). In total 13 phakic eyes of 13 patients who underwent vitrectomy and silicone oil filling were enrolled into the study. AEL was measured by B-scan and compared to measurement by PCI. Results & Conclusions: there was no significant difference in AEL measurement by either B-scan ultrasonography through the eyelid, after a correcting factor, and PCI.