Silicone Oil Removal Research Articles

Corneal Astigmatism Alteration after Combined Silicone Oil Removal and Cataract Surgery with Intraocular Lens Implantation.

To explore short-term changes in corneal astigmatism after combined silicone oil removal and cataract (SORC) surgery. We enrolled 89 patients (43 men and 46 women). Zeiss IOLMaster was used to measure corneal astigmatism status and axial length on the day before and after the SORC surgery. Best-corrected visual acuity (BCVA) and intraocular pressure (IOP) were recorded. The results were compared to the outcomes at 3 days, 1 week, and 1 month postoperatively. Compared to baseline, K1 decreased significantly at 3 days postoperatively (P = 0.016), 1 week (P = 0.009), and 1 month (P = 0.035), while K2 increased significantly at 3 days postoperatively (P = 0.002), 1 week (P < 0.001), and 1 month (P = 0.001), as well as corneal astigmatism (all P < 0.001). Compared to that at the baseline, BCVA significantly improved at 3 days, 1 week, and 1 month postoperatively (all P < 0.001). Meanwhile, IOP decreased significantly at 3 days postoperatively (P < 0.001), 1 week (P = 0.005), and 1 month (P = 0.007). Similarly, axial length decreased at all follow-up time points (all P < 0.001). Corneal astigmatism increased in the short term after the SORC operation but gradually decreased at 1 month postoperatively. BCVA improved steadily, and SORC was widely used in the clinic.

Removing silicone oil quickly using a manual device

Removing silicone oil quickly using a manual device

Electroretinogram changes before and after silicone oil removal in eyes with macula-off rhegmatogenous retinal detachment

Background: Pars plana vitrectomy (PPV) with silicone oil (SO) injection for rhegmatogenous retinal detachment (RRD) repair may adversely affect electroretinographic responses. This study was aimed at assessing retinal function using electrodiagnostic testing after successful PPV with SO tamponade in the eyes with macula-off RRD.&#x0D; Methods: In this interventional comparative study, eligible participants were recruited prospectively over 1 year. We included the eyes that underwent a single successful three-port PPV with SO tamponade for the primary repair of macula-off RRD. Full-field electroretinogram (ffERG) and multifocal electroretinogram (mfERG) were recorded 1 day before and 3 days after SO removal. The amplitude and implicit time of the a- and b-waves for ffERG and P1 and N1 waves for mfERG were evaluated. The unaffected fellow eyes of the patients were selected as controls.&#x0D; Results: We included the ten eyes of ten patients (seven men and three women) with a mean (standard deviation) age of 58.8 (6.2) years. The mean (SD) interval between the diagnoses of macula-off RRD and PPV was 11.7 (3.6) days. The mean (SD) duration of SO tamponade was 147.8 (34.9) days. Using ffERG, significantly lower a- and b-wave amplitudes were found in the eyes before and after SO removal or compared to the unaffected fellow eyes (all P &lt; 0.05). Using the mfERG, treated eyes had significantly lower P1 amplitudes in the central R1+R2+R3 rings and in the R4 and-R5 peripheral rings of the macular area in the eyes before and after SO removal or compared to the unaffected fellow eyes (all P &lt; 0.05). The wave implicit time in ffERG and mfERG did not differ significantly in the eyes before and after SO removal or compared to the unaffected fellow eyes (all P &gt; 0.05).&#x0D; Conclusions: The electrical retinal response density in ERG waveforms increased following SO removal, indicating amelioration of the electrical activity of the retina and macula. These results indicate that the adverse effects of SO tamponade on electroretinography responses may be reversible with removal. In addition, ffERG and mfERG can be used to monitor retinal function in the eyes with macula-off RRD and SO tamponade. Further clinical trials are required to verify the preliminary findings of this study.

Fouling Resistance and Release Properties of Poly(sulfobetaine) Brushes with Varying Alkyl Chain Spacer Lengths and Molecular Weights

We examined the effects of alkyl carbon spacer length (CSL) and molecular weight on fouling resistance and release properties of zwitterionic poly(sulfobetaine methacrylate) brushes. Using surface-initiated atom transfer radical polymerization, we synthesized two series of brushes with CSL = 3 and 4 and molecular weight from 19 to 1500 kg ·mol-1, corresponding to dry brush thickness from around 6 to 180 nm. The brush with CSL = 3 was nearly completely wet with water (independent of molecular weight), whereas the brush with CSL = 4 exhibited a strong increase in water contact angle with molecular weight. Though the two-brush series had distinct wetting properties, both series of brushes exhibited similarly great resistance against fouling by Staphylococcus epidermidis bacteria and Aspergillus niger fungi spores when submerged in water, indicating that neither molecular weight nor CSL strongly affected the antifouling behavior. We also compared the efficacy of brushes against fouling by fungi and silicon oil in air. Brushes grafted to filter paper were strongly fouled by fungi and silicon oil in air. Grafting the polymers to the filter paper, however, greatly enhanced removal of the foulant upon rinsing. The removal of fungi and silicon oil when rinsed with a salt solution was enhanced by 219 and 175%, respectively, as compared to a blank filter paper control. Thus, our results indicate that these zwitterionic brushes can promote foulant removal for dry applications in addition to their well-known fouling resistance in submerged conditions.

Silicone oil tamponade in surgical treatment of rhegmatogenous retinal detachment

The article presents a literature review regarding the use of silicone oil tamponade (ST) in rhegmatogenous retinal detachment (RRD) treatment. Vitrectomy, which produces a stable anatomical result in most patients, is currently recognized as one of the main methods of treating RRD. In complicated retinal detachments, vitrectomy is followed by ST tamponade of the vitreous cavity (VC). Despite the many benefits of ST, it carries the risk of a number of complications arising at different times after surgery. The duration of ST presence in the vitreous cavity during RRD treatment may vary substantially. The review presents ST complications, including an unexpected and hard to explain vision deterioration after silicone oil removal, and the correlation between the complications and the duration of ST presence in the vitreous cavity.

Complete manuscript title: role of sub-silicone oil application of triamcinolone acetonide (TA) drops on outcomes after 360° relaxing retinectomy: a pilot study.

To perform a pilot study to evaluate the role of sub-silicone oil Triamcinolone Acetonide (TA) crystal drops in complex Retinal Detachment (RD) with extreme proliferative vitreoretinopathy (PVR) requiring 360-degree relaxing retinectomy (RR). It was a retrospective pilot study. It was a retrospective case-control pilot study. TA-assisted 23G or 25G vitrectomy was done in 24 complex RDs with extreme PVR where 360 degree RR had to be performed. Group A (n = 13) included cases where additional TA crystal drops were applied, after settling the detached retina, over the site of RR under silicone oil (SO 5000 CSt) tamponade. In the control arm, group B (n = 11), additional TA crystals were not applied. Mean pre- and post-operative BCVA, ultra-widefield fundus photograph by Optos 200Tx, macular OCT and the propensity to remove silicone oil were measured. Mean pre-operative and post-operative BCVA at final follow-up were Log MAR 2.69 ± 0.41 and Log MAR 1.51 ± 0.90 (Mann-Whitney U test, p < 0.05), respectively, in Group A and Log MAR 2.9 and Log MAR 2.37 ± 0.86 (Mann-Whitney U test, p < 0.05), respectively, in group B. Visual improvement in group A was significantly better than group B (Wilcoxon W test, p < 0.025) with significantly less recurrence of RD (Fisher's Exact Test, p = 0.002). Silicone oil removal was done significantly more in group A (Fisher's Exact Test, p = 0.0017). Sub-silicone oil crystals application over sites of RR after 360-degree relaxing retinectomy leads to improved postoperative visual recovery as well as improved anatomical outcomes with fewer complications.

Predictors for Visual Outcome After Silicone Oil Removal in Eyes with Complicated Retinal Detachment.

To determine the predictors for visual outcome after silicone oil removal (SOR) in eyes with complicated retinal detachment. A total of 182 eyes with complicated retinal detachment that had undergone SOR were retrospectively reviewed. Snellen best-corrected visual acuity (BCVA), intraocular pressure (IOP) and complications were recorded at baseline, 1 day, 1 month and 3 months postoperatively. Good visual outcome was defined as best-corrected visual acuity of ≥20/200 at 3 months visit. Factors predicting visual outcome were evaluated using univariate and multivariate analysis. After SOR, anatomical retinal reattachment was noted in 165 eyes (90.66%). Good visual outcome (VA ≥ 20/200) was achieved in 104 eyes (57.14%) at 3 months after SOR. For the eyes that remained attached after SOR, the percentage of good visual outcome was 63.03%. With univariate and multivariate analysis, visual acuity before SOR (p<0.001), circumferential peripheral retinopexy (p=0.037), additional endolaser during SOR (p=0.004), and pseudophakia status at the last follow up (p=0.021) were associated with visual outcome. Complications after SOR included redetachment (9.4%), hypotony (6.6%) and bullous keratopathy (1.7%). While anatomically attached retina was achieved in most of the patients, the functional outcomes were still much lower. Good BCVA before SOR and pseudophakia status at the last follow up were predictors for good visual outcomes, whereas circumferential peripheral retinopexy and additional endolaser during SOR were predictors for poor visual outcomes after SOR in eyes with complicated retinal detachment.

Successive trabecular meshwork photocoagulation in the treatment and prevention of refractory hypotony.

To evaluate the effect of successive trabecular meshwork photocoagulation (sTMP) on the elevation of intraocular pressure (IOP) to treat or prevent refractory hypotony. The IOP changes of 15 refractory hypotonic eyes (or estimated to be hypotonic after silicon oil removal) in 15 consecutive patients were retrospectively analysed after sTMP. Fourteen eyes had intraocular silicone oil that was to be removed. Different lasers were used to destroy the trabecular meshwork 1-5 times (2.00±1.20 times on average) via the gonioscope or endoscope. Twelve eyes had a large area of exposed retinal pigment epithelium due to a large area of retinecotomy, one eye had a severe cyclitic scar, and two eyes had both a scar and a retinal defect. After sTMP (1 to 125 months of follow-up, 22.87±38.88 months), the average IOP in the 15 eyes was 11.70±3.19mmHg (n=15), significantly higher than the value before sTMP (8.26±1.93mmHg, P<0.05). The IOP of the 15 eyes increased by 3.44±2.61mmHg, Eight eyes with an IOP of less than 10mmHg before sTMP showed an IOP ≥10mmHg after sTMP. Following sTMP, the silicone oil was removed from six eyes, and one of these eyes suffered a retinal detachment. sTMP can significantly increase the IOP with a long-lasting effect and provide an opportunity for the removal of silicone oil despite large-area retinal defects or cyclitic scars in selected eyes.

Metallic intraocular foreign body removal assisted through the extrusion line

AbstractPurpose: To describe an alternative vitreoretinal surgical manoeuvre, to remove metallic intraocular foreign bodies.Methods: Two patients, at different time lines, underwent vitrectomy to remove a metallic intraocular foreign body (IOFB). A 3‐port vitrectomy was performed, a 23‐G constellation vitrectomy equipment was used in both procedures, careful core vitrectomy was first done, vitreous adhesions and vitreous detachment was carefully done, retina was partially detached at the IOFB location, vitreous adhesions were cut and released gently not to increase the retinal detachment. Liquid prefluorocarbon was placed on the macula. As the vitreous adherences were cut, the IOFB was free from all potential tractional forces, the soft silicone tip cannula was held on to its surface, and at maximal vacuum aspiration, the IOFB was brought up to the anterior chamber, switching the light pipe for forceps in the other hand, and removed out of the eye. A complete as possible vitrectomy was performed, intraocular laser around the retinal brakes was performed, an intraocular lens was placed in the ciliary sulcus with the optic within the anterior capsule, and silicone oil was used as tamponade.Results: No signs of intraocular inflammation were recorded postoperatively. Intraocular silicone oil removal was done at the third post‐operative month in both cases, retina remained attached through follow up, both patients had over 9 months follow‐up visits, visual acuity improved from initial presentation, and also improved after the silicone oil tamponade removal.Conclusions: Active aspiration through the soft silicon tip cannula can be used to reach, and assist removal of metallic intraocular foreign bodies, being this manoeuvre safe, reproducible, possibly time‐saving, and also it could potentially avoid the risk of IOFB mobilization, avoiding further damage to the retina.

Application of the three-step method of mydriasis with prone position followed by anterior chamber paracentesis in post-vitrectomy vitreous hemorrhage.

Application of the three-step method of mydriasis with prone position followed by anterior chamber paracentesis in post-vitrectomy vitreous hemorrhage.

Hypersonic vitrectomy: a novel approach to vitreous removal

ABSTRACT Introduction Pars plana vitrectomy is the basis of modern retina surgery, and for the last 40 years, has been achieved using the pneumatic guillotine cutter. Recently, a new vitrectomy design has been developed: the hypersonic vitrector. This technology utilizes ultrasound energy to liquefy vitreous in contrast to the mechanical segmentation of vitreous strands that characterizes pneumatic cutters. Areas covered This review provides a history of the development of vitrectomy and summarizes the critical elements of effective and safe vitrectomy systems. The article will describe the novel hypersonic vitrectomy design, discuss what the initial pre-clinical and in-human studies tell us about its performance compared to standard pneumatic cutters, and considers its role in the future of retina surgery. Expert opinion Hypersonic vitrectomy is the first novel way to segment vitreous since the development of pneumatic guillotine cutters. It has the potential to make vitrectomy more efficient both by reducing operating times as well as enabling surgeons to remove silicone oil and retained lens material all with one instrument. With concurrent advancements in guillotine cutters, hypersonic vitrectomy has a high bar to clear to demonstrate advantages that would result in widespread adoption.

Logbook of a Retinal Autograft.

This study aimed to evaluate the prognosis of a retinal autograft that was used to treat a macular hole that occurred after repeated vitreoretinal surgeries. A patient underwent repeated vitreoretinal surgery due to retinal detachment in the right eye, and the internal limiting membrane was also removed during the surgeries. After silicone oil removal, the patient developed recurrent retinal detachment and macular hole, and for this reason a retinal autograft was applied to the macular hole and silicone tamponade was administered. The silicone oil was removed at postoperative 7 months, and the macular hole was observed to be closed on fundus examination at 18 months. The final visual acuity was 5/100. On optical coherence tomography (OCT), the hole in the detached retina was measured as 600 µm in diameter preoperatively, 1020 µm on the first postoperative day, gradually narrowed to 765 µm, and graft integration occurred. During follow-up, the accumulation of hyperreflective spots persisted on the inner surface of the graft tissue and in all vertically extending sections. In en face sections, it appeared as a hyperreflective arc between the graft and host retina with a shadowing artefact. In OCT angiography evaluation, a punctate multiple blood flow signal in the vertical axis of the graft was detected in the early phase at 3 months. This finding persisted at 1 month after silicone removal, and the flow signal disappeared with resorption of the cystic edema. These flow signals were in the same location as the areas of hyperreflective spots on structural OCT. In conclusion, structural OCT and OCT angiography are effective methods for the follow-up of retinal autograft integration into host tissue.

A reminder about silicone oil toxicity: three cases over five years in a tertiary hospital.

Presumed silicone oil-related retinal toxicity causes central vision loss with a reported incidence of 1-33% in the first month after oil removal and 10% in the first six months of having silicone oil in-situ. This report examines local rates in a tertiary hospital that manages many geographically distanced patients. A miniature literature review, audit and case series are presented. A retrospective audit of all patients who underwent a 'removal of silicone oil' surgery at the Royal Brisbane and Women's Hospital between 2016 and 2021. Inclusion criteria were that the oil was inserted for primary or recurrent rhegmatogenous retinal detachment. Visual acuity was analysed at presentation, at 1 and 3months of oil in-situ, preoperatively to removal of oil and up to 6months after oil removal. Ocular coherence tomographic parameters were examined at each time interval, including nerve fibre layer (NFL) and ganglion cell layer and inner plexiform layer (GCL + IPL) thicknesses in the 3mm parafoveal zone, presence of inner retinal microcystic changes or intraretinal silicone oil globules. Patients were identified who had unexplained vision loss of two or more Snellen lines. Further analysis and case review were performed. Between January 2016 and May 2021, 101 patients met the inclusion criteria. Three patients had significant and unexplained visual loss. They are presented in this paper. Presumed silicone oil toxicity is an increasingly recognised and potentially devastating phenomenon that vitreo-retinal surgeons should be wary of. Patients should be specifically consented for it and hospitals should perform local auditing to determine their own rates and inform this discussion.

Effect of Silicon Oil Tamponade and Its Removal on Central Macular Thickness in Cases of Rhegmatogenous Retinal Detachment Using Swept Source OCT

Purpose: To evaluate the effect of silicone oil (SO) tamponade and its removal on central macular thickness (CMT) and average macular thickness (AMT). Study Design: Quasi experimental study. Place &amp; Duration of Study: Jinnah Postgraduate Medical Centre, Karachi, from June 2021 to April 2022. Methods: A total of 27 patients with 27 eyes with rhegmatogenous retinal detachment were included. Pars Plana Vitrectomy (PPV) with SO tamponade was performed. Removal of silicon oil (ROSO) was performedafter six months. Optical Coherence Tomography (OCT) was done before PPV, one month after PPV and one month after ROSO. The Central macular thickness (CMT) and Average macular thickness (AMT) were measured and compared between operated and control eyes. Results: The mean CMT and AMT before surgery was 230 ± 60.5 μm and 253.3 ± 40.3 μm respectively. The mean CMT one month after PPV with SO was 281 ± 62.8 μm and 232 ± 62.2 μm in the operated eyes and control eyes (p = 0.053). Mean AMT one month after PPV with SO was 294 ± 98.7 μm and 253 ± 37.0 μm in operated and control eyes (p = 0.182). Mean CMT one month after SO removal was 222 ± 81.5 μm in operated eyes and 230 ± 59.2 μm in control eyes (p = 0.056). Mean AMT one month after SO removal was 263 ± 45.0 μm in operated eyes and 254 ± 21.4 μm in the control eyes (p = 0.087). Conclusion: There was no statistically significant difference in the CMT and AMT before and after silicone oil tamponade and its removal, in patients with Rhegmatogenous Retinal Detachment.

Этапное хирургическое лечение осложненной начальной катаракты у пациентов с далекозашедшей стадией пролиферативной диабетической ретинопатии

Purpose. To evaluate the efficacy of phacoemulsification of primary cataract by the second stage after vitreoretinal surgery of PDR patients. Material and methods. 187 cases of surgery treatment of patients with PDR and complicated primary cataract were enrolled. This patients were divided into four groups depending on the treatment tactics. In the 1st group patients were subjected to a two–step surgical procedure: vitreoretinal surgery with silicone oil tamponade performed as the 1st step in their treatment; followed by the 2d step, phacoemulsification surgery and silicone oil removal, and the IOL implantation, respectively. In the 2d group phacoemulsification performed simultaneously with vitreoretinal surgery: phacoemulsification, IOL implantation, vitreoretinal surgery with silicone oil tamponade. The second step differed in the removal of silicone oil from the vitreous cavity. In the 3rd group patients were subjected to a two–step surgical procedure: vitreoretinal surgery with gas tamponade performed as the 1st step in their treatment; followed by the 2d step, phacoemulsification surgery and the IOL implantation. In the 4th group phacoemulsification performed simultaneously with vitreoretinal surgery: phacoemulsification, IOL implantation, vitreoretinal surgery with gas tamponade. Results. Outcomes of the preliminary studies suggest that it is more viable to perform phacoemulsification surgery sometime later along on PDR patients with complicated primary cataract. Conclusions. This sequence of treatment procedure ensures a more gentle approach to the anatomic structures of the eye during the first stage (vitreoretinal surgery) and contributes to the reduction in the number of intraoperative and postoperative complications. Keywords: diabetic retinopathy, cataract, vitreoretinal surgery.

Structure and Macular Sensitivity Characteristic After Silicone Oil Removal in Primary Rhegmatogenous Retinal Detachment

Introduction: Silicone oil (SO) is an endotamponade to manage several retinal detachments.The emulsification of silicone oil is one of the complications that may occur in several patients. Retinal macular changes may occur even with successful tamponade. Purpose: to describethe structure and macular sensitivity characteristic after silicone oil removal in primary rhegmatogenous retinal detachment (RRD). Methods: a prospective, descriptive case series study of who underwent SO tamponade for primary RRD. Optical coherence tomography (OCT) and microperimetry (MP-3) were conducted before SO removal and one week after SO removal. Result: There were nine eyes that met the criteria. The mean age of the patients was 53.3?14 years. Most of the patients use silicon 1300 (66.67%) and under six months (77.8%) duration of silicone tamponade. After silicone oil removal, mean macular sensitivity in the central fovea decreased from 12.44 dB to 12.11 dB, and parafovea increased from 18.33 dB to 19.00 dB.The mean macular thickness in the fovea decreased from 269.89?m to 260?m. The mean macular thickness in parafovea was an increase from 316.16 to 328.00?m Conclusion: There was an increase in macular sensitivity and thickness at parafovea after oneweek silicone oil removal in primary rhegmatogenous retinal detachment

Changes in axial length after vitrectomy for rhegmatogenous retinal detachment combined with choroidal detachment.

To report the postoperative axial length (AL) changes in rhegmatogenous retinal detachment combined with choroidal detachment (RRD-CD) patients. The medical records of 97 consecutive patients from January 2015 to December 2018 were reviewed. Patients included were divided into RRD-CD and RRD only groups. All patients had received AL measurements before pars plana vitrectomy (PPV) and before silicone oil removal (SOR). The changes in AL of the two groups were compared. In addition, the potential factors related to AL changes were analyzed. AL elongation after PPV was 1.01 mm [interquartile range (IQR): 0.37, 1.79; P=0.02] in the RRD-CD group, which was greater than in RRD only group (0.15 mm, IQR: 0.04, 0.41; P<0.001). AL increased 0.06 mm per 1 mm Hg intraocular pressure changes in the RRD-CD group (R 2=0.11, P=0.03). RRD-CD patient was 11.42 times (3.54-46.80) more likely to experience post-PPV AL elongation of more than 1 mm [P<0.001, Akaike information criterion (AIC)=92.33, area under the curve (AUC)=0.839]. RRD-CD patients are very likely to have a postoperative elongation of AL. The primary intraoclular lens implantation using presurgery AL data may cause a significant refractive error in RRD-CD patients who underwent PPV.

Outcomes of Retinectomy without Lensectomy in Rhegmatogenous Retinal Detachments with Proliferative Vitreoretinopathy

To report the anatomic and functional outcomes of retinectomy without lensectomy in eyes with rhegmatogenous retinal detachment (RRD) and proliferative vitreoretinopathy (PVR). Retrospective, noncomparative, and interventional case series. One hundred twelve eyes of 112 patients with RRD complicated by PVR who underwent retinectomy without lensectomy. Retrospective review of patients treated with vitrectomy and retinectomy without lensectomy from January 1, 2015, to January 1,2020. The primary outcome was the final attachment rate and single surgery anatomic success (SSAS) at 3 and 6 months after retinectomy. Secondary outcomes included predictors of final visual acuity (VA), the mean number of subsequent operations required for complete retinal reattachment, cataract surgery, and the number of eyes that ultimately had successful silicone oil removal. Complete final retinal reattachment was achieved in 111 of 112 (99.1%) patients, with a mean (standard deviation [SD]) follow-up of 29 (14) months (range, 8-62 months) after retinectomy. The SSAS was achieved in 84 of 112 (75%) patients at 3 months and 73 of 112 (65.2%) patients at 6 months. The final VA improved or stabilized in 76 of 112 (67.9%) eyes. Silicone oil removal was performed in 72 of 112 patients (64.3%) at a mean (SD) of 6.6 (3.3) months, and cataract surgery was performed on 101 (90.2%) eyes before the last follow-up visit. Retinectomy without lensectomy to repair RRDs complicated by PVR showed acceptable anatomic and functional results. This study suggests that removing the lens when there is no significant cataract may not be necessary in these cases to obtain reasonable outcomes.

Topical Vs Pribulbar Anesthesia in Patients Undergoing 23 Guage ,Three Ports Removal of Sillicone Oil

Objective: To compare safety as well as efficacy of topical anesthesia against peribulbar anesthesia for patients undergoing three ports pars plana removal of silicone oil . Background: Silicone oil is used as a temponarding agent for vitreoretinal procedures and have to be removed according to the duration of temponard required as it is associated with complications like development and acceleration of cataract devlopment , secondary open angle glaucoma and corneal decompensation. It can be removed via three port 23 gauge ROSO procedure both under topical and peribulbar anesthesia. Patients &amp; Methods: 40 eyes from 40 patients who underwent three port ROSO with a 23 gauge port system were randomised into two groups of 20 patients each for this study. In group A eyes was operated under topical anesthesia using soaked cotton wisk with 0.5 % proparacaine hydrochloride , placed for five minutes in superior and inferior fornix before the start of surgery and the group B was operated under peri bulbar block with 4 ml of bupivacaine given five minutes before the start of surgical procedure. Pain scoring charts were used by patients to rate their pain after the procedure. Results: The patients in this study had a mean age of 58.46 ±3.62 years, with a range of 30-65 years. 40 individuals were treated, with 26 being male and 14 being female. The mean pain score for patients in topical anesthesia group was 3.8+- 0.5 and the mean pain score in peribulbar block group was 2.2+-0.2 with a p value of 0.01. Conclusion: Peribulbar block is superior to topical anesthesia in patient comport for patients undergoing three port ROSO procedures. Keywords: ROSO, Silicone oil, peribulbar, Topical anesthesia, Bupicaine, Proparacaine hydrochloride.

Comparison of optical biometry and conventional acoustic biometry in the axial length measurement in silicone oil-filled eyes.

To compare the axial length (AL) obtained by A-scan biometry (PAC SCAN 300AP; Sonomed Escalon, USA) and LENSTAR-LS 900 (Haag-Streit, Koeniz, Switzerland) in silicone oil (SiO)-filled eyes. AL measurements were taken in 50 SiO-filled eyes using A-scan and LENSTAR-LS 900 before SiO removal and 1 month following SiO removal. In the subset of patients requiring intraocular lens (IOL) insertion, the predicted refraction and the refraction obtained were compared. IOL power in these patients was calculated using SRK-T formula and the AL obtained by LENSTAR. In SiO-filled eyes, a significant difference was noted between the AL values obtained using the two methods (P = 0.0002). No significant difference was noted after SiO removal (P = 0.634). In the subset of patients needing IOL insertion, no significant difference (P = 0.07) was seen between target refractive error and postoperative refractive error (mean deviation from the target being 0.176 diopter). AL of an SiO-filled eye is more accurately measured using optical low coherence reflectometry (OLCR)-based biometry (LENSTAR) than with conventional acoustic biometry (A-scan). We conclude that LENSTAR gives more accurate biometry in an SiO-filled eye. The AL obtained after SiO removal was comparable and showed no significant difference.