Polydimethylsiloxanes (PDMS), (CH3)3SiO-[Si(CH3)2O]n-Si(CH3)3, known as silicone oil is a tamponade liquid which is very important in vitreoretinal surgery, especially in the treatment of complicated retinal detachment. Here, we investigated the optical properties and structure of silicone oil with high viscosity silicone oil of 5500 cSt and low viscosity silicone oil of 1300 cSt in order to understand the changing of physical properties of silicone oil before and after using in vitreoretinal surgery as a tamponade liquid and analyze the relationship between the tamponade duration and changed in silicone oil properties. From UV-Vis spectroscopy and refractometer measurement, it is found some changes in transmittance and refractive index values in both silicone oil after using as a tamponade liquid. From fourier transform infrared (FT-IR) spectroscopy, some additional of functional groups of N-H and O-H bond are observed at 1634.5 cm-1 and 3435.7 – 3764.5 cm-1, respectively. The changes of optical and structure properties of silicone oil after using as a tamponade liquid are assumed to be responsible in emulsification of silicone oil and affect the transmittance quality at visible light spectrum. However, in this study, there is no linear corelation between tamponade duration and changed in silicone oil properties.

IntroductionThe incidence of blindness due to methanol intoxication is higher in males of productive age. The management of methanol-induced toxic optic neuropathy is yet to produce satisfactory results. Antioxidant therapy is now used as an alternative method of preventing methanol intoxication. The aim of this study was to observe the effect of TEMPOL (4-hydroxy-2,2,6,6-tetramethylpiperidinyl-1-oxyl), a superoxide dismutase (SOD) mimetic, on retinal ganglion cells in methanol-intoxicated rats.MethodsThis experimental study was conducted with 20 male Wistar rats that were 10–12 weeks old and weighed 300–350 g. The rats were divided into four groups that each received a different treatment: a negative control group, a positive control group, a methanol group, and a methanol + TEMPOL group. Enucleated eyes from all groups were sliced and stained using hematoxylin–eosin (HE). Retinal layer and ganglion cells were assessed based on cellular structure, cellular swelling, and vacuole formation in the ganglion cell layer as observed at × 200 magnification. The Kruskal–Wallis test and the Mann–Whitney test were used, with significance taken to correspond to p < 0.05.ResultsRetinal ganglion cells of the control group had fewer vacuoles and a more well-organized cellular structure compared to those of the methanol group. The histopathologic scores of the methanol-intoxicated group were lower than those of the TEMPOL therapy group; p = 0.011 (i.e., p < 0.05).ConclusionsTEMPOL had a positive impact on the cellular structure of retinal ganglion cells in methanol-intoxicated rats.

Since coronavirus disease 2019 was declared a global pandemic by the World Health Organization, it has become a challenging situation to continue medical education, including in Indonesia. The situation prohibited face-to-face (direct) educational activities in clinical settings, therefore also postponing examinations involving especially procedural skills. Adaptations were urgently needed to maintain the delivery of high-stake examinations to sustain the number of ophthalmology graduates and the continuation of eye health service. Objective structured clinical examination (OSCE) has been one of our widely used method to assess clinical competencies for ophthalmology residents, and is the one method that involves gatherings, close contact of examiners, examinees and patients, therefore the most difficult to adjust. Pandemic challenges brought technical changes in our delivering the OSCE to online, maximizing digital platforms of meetings, while still concerned to guarding the safety of candidates, patients and staffs. OSCE scenarios were also made as timely efficient as possible by changing continuous station models to a cascade one. The purpose of this article is to document our experience in conducting a feasible and reproducible OSCE in this pandemic era filled with limitations.

Introduction: Determine the prevalence and associated factors of diabetic retinopathy (DR) among people with type 2 diabetes. Design: Cross-sectional study Methods: We obtained data of people with type 2 diabetes retrospectively from a community-based DR screening database in Greater Bandung, Indonesia. We encoded the two fields mydriatic 45-degree fundus images to estimate prevalence. The associated factors analysis used multivariate logistic regression. Results: We screened a total of 4,251 people with type 2 diabetes from January 2016 to December 2019. The overall age-standardised prevalence of any DR was 30.7% (95% CI: 28.7%-32.8%) and vision-threatening DR 7.6% (95% CI: 6.5%-9.0%). The following factors were associated with a higher prevalence of any DR: ages 50+ (OR:1.37;  95% CI:1.05-1.77), duration of diabetes five to ten years (OR:1.38; 95% CI:1.11-1.71) and more than ten years (OR:1.40; 95% CI:1.13-1.73), and postprandial blood glucose 200 mg/dl and higher (OR:1.27; 95% CI:1.03-1.52). The following factors were associated with a higher prevalence of vision-threatening DR: duration of diabetes five to ten years (OR:2.01; 95% CI:1.39-2.91) and more than ten years (OR:1.86; 95% CI:1.28-2.71), postprandial blood glucose 200 mg/dl or higher (OR:1.52; 95% CI:1.05-2.21) and systolic blood pressure 180 mmHg or higher (OR:2.67; 95% CI:1.16-6.17). Conclusion: Diabetic retinopathy is prevalent among people with type 2 diabetes. People with diabetes should regulate their blood glucose and blood pressure to prevent retinopathy related vision loss.

Purpose: To compare in vivo emulsification of silicone oil 1000 and 5000 centistokes (cs) after retinal detachment surgery. Design: Comparative non-interventional Retrospective study. Methods: Silicone oils from patients who underwent retinal detachment surgery were investigated using Spectrophotometer UV-Vis. Spectroscopically changes determine emulsification with the time of tamponade, inflammation, patients age and severity of retinal detachment. Results: We found significant difference on absorbance (p = 0.004) between used 1000 Centi stoke (cs) silicon oil (average wave length 2.51 nm; SD: 1.575 nm) and used 5000 cs silicon oil (average wave length 0.910 nm; SD: 0.564 nm). Conclusions: In vivo emulsification was higher in silicone oil 1000 compared to 5000 cs silicone oil after vitreoretinal tamponade 8 -12 weeks due to retinal detachment surgery. Emulsification related to higher absorbance and lower transmittance in 1000 cs silicone oil. Inflammation may become a factor affecting this condition.