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Objectives To assess publications examining the occurrence, composition, and clinical significance of a microbiome at the ocular surface. Methods MEDLINE, EMBASE, and Google Scholar were searched. Reference lists of included articles were also searched for relevant citations. All publications up to June 1, 2019, were analyzed. Results Eleven articles and 1 abstract were included, analyzing 661 patients. Articles generally report bacteria to the genus level. The presence of DNA associated with diverse bacterial species was reported including pathogenic species, such as Pseudomonas and Neisseria. Bacterial DNA that makes up the microbiome, such as Acinetobacter, Actinomyces, Aquabacterium, Bradyrhizobium, Corynebacterium, Sphingomonas, Staphylococcus, and Streptococcus, in other parts of the body was found. The putative ocular microbiome is consistent between right and left eyes and is affected by contact lens use (higher Pseudomonas levels) and blepharitis (higher Staphylococcus levels). Conclusions There is a significant likelihood that there is at least a transitory ocular surface microbiome, with Acinetobacter, Corynebacterium, Propionibacterium, Staphylococcus, and Streptococcus detected in at least 7 of 11 studies. However, further investigation attempting to control for environmental and methodological contaminants (Aquabacterium and Bradyrhizobium are commonly identified as contaminants in DNA extraction kits) is required. Bacteria, such as Propionibacterium, Staphylococcus, and Streptococcus, capable of causing sight-threatening infections may reside on a healthy ocular surface. With greater understanding, we can establish whether elements of the ocular surface microbiome are harmful or protective (despite their small quantities); furthermore, new therapeutic agents can be identified to treat and prevent ocular surface infection and inflammation.Purpose To compare corneal endothelium parameters taken by two common noncontact specular microscopes in healthy subjects. Methods Healthy participants visiting the outpatient eye clinic at the Rabin Medical Center, Petah Tikva, Israel, were recruited prospectively. All participants underwent three consecutive corneal endothelial cell photographs with both the Konan-Noncon Robo SP-6000 and the Tomey EM-3000 specular microscopes. Endothelial cell density (ECD) was evaluated using the manual center technique in both machines. Bland-Altman graphs were used to assess the agreement between the devices, and intraclass correlation coefficient (ICC) served to assess intraobserver variability for each device. Results Recruited were 49 healthy subjects with a mean age of 48.9±15.6 years, 49 right eyes were included. The mean ECD was comparable between the Tomey EM-3000 and the Konan-Noncon Robo SP-6000 (2,713.2±242.4 vs. 2,700.8±300.5 cells/mm, respectively, P=0.47) with a mean difference of 12.4 cells/mm (0.67%), a mean ECD absolute difference of 93.3 cells/mm, and low 95% limits of agreement of -222.0 to +246.9 cells/mm. A folded empirical distribution function curve showed that all differences fell within 525.4 cells/mm, centered around a median of 13.3 cells/mm. Intraclass correlation coefficient was high for both the Konan-Noncon Robo SP-6000 (0.93, 95% confidence interval [CI] 0.89-0.95) and the Tomey EM-3000 (0.88, 95% CI 0.82-0.93). Conclusions The difference in endothelial cell measurements between the Konan SP-6000 and the Tomey EM-3000 specular microscopes through the center and the L-count analyzing techniques, respectively, is clinically small and not statistically significant. https://www.selleckchem.com/mTOR.html Nevertheless, caution should be taken when used interchangeably because ECD difference between the two machines can be as high as 525.4 cells/mm.Purpose To evaluate the effect of a single subconjunctival aflibercept injection on formed corneal neovascularization. Methods A prospective clinical trial, conducted at a single tertiary medical center. Included were consecutive patients with corneal pathologies complicated by corneal neovascularization, who were candidates for anti-vascular endothelial growth factor treatment at the discretion of a cornea specialist. A single subconjunctival injection of 0.08 mL of Aflibercept (Eylea 25 mg/mL) was administered near the limbus in proximity to the areas of maximal pathological neovascularization. Follow-up visits were scheduled on days 7, 30, 60, and 90 following injection. Best-corrected visual acuity (BCVA), intraocular pressure, slitlamp examination, digital cornea photography, specular microscopy, and anterior-segment optical coherence tomography were documented at each visit. The images were graded by a masked observer for density, extent, and centricity of corneal vascularization. Results Six eyes of six patients were analyzed. No clinically significant ocular or systemic adverse events were documented. No change was noted in extent, density, or centricity of corneal blood vessels at seven, 30, and 90 days after injection (P>0.1 for all time point comparisons, Friedman test). Best-corrected visual acuity fluctuated insignificantly in 5/6 patients during follow-up time, and objective but not subjective improvement of BCVA was noted in one patient with no concurrent change of neovascularization. The recruitment has therefore halted prematurely. Conclusions A single subconjunctival aflibercept injection seems to be well tolerated. However, it is ineffective for regressing formed corneal neovascularization.Objective To compare the efficacies of 0.02% atropine eye drops and orthokeratology to control axial length (AL) elongation in children with myopia. Methods In this historical control study, 247 children with myopia whose administration of 0.02% atropine (n=142) or underwent orthokeratology from an earlier study (n=105, control group) were enrolled. Data on AL and other baseline parameters were recorded at baseline and after 1 and 2 years of treatment. Results The mean changes in AL in the first and second years of treatment were 0.30±0.21 and 0.28±0.20 mm, respectively, in the 0.02% atropine group and 0.16±0.20 and 0.20±0.16 mm, respectively, in the orthokeratology group. Axial length elongations after 2 years of treatment were 0.58±0.35 and 0.36±0.30 mm (P=0.007) in the 0.02% atropine and orthokeratology groups, respectively. Multivariate regression analyses showed that the AL elongation was significantly faster in the 0.02% atropine group than in the orthokeratology group (β=0.18, P=0.009). In multivariate regression analyses, younger age and shorter baseline AL were associated with a rapid AL elongation in the 0.
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