Effect of high myopia on 24-hour intraocular pressure in patients with primary open-angle glaucoma

Background As intraocular pressure （lOP） and lOP fluctuation are known risk factors for glaucoma, it is important to understand the effects of high myopia on these ocular parameters. The aim of this study was to investigate if primary open-angle glaucoma （POAG） patients with high myopia exhibit higher lOP and greater lOP fluctuations at resting conditions over 24 hours. Methods We designed a prospective control clinical study. Eighty-two eyes of 82 high-tension Chinese POAG patients only on prostaglandin analogue locally were divided into 3 groups according to various myopic grades （〈-6.0 D, n=27 and between -0.76 and -5.99 D, n=33） or without myopia （-0.75 to 0.75 D, n=22）. Single time lOP at 10 am, mean corrected 24-hour lOP, mean corrected night lOP, 24-hour lOP fluctuation and lOPs of 10 am, 2 pm, 6 pm, 10 pm, 2 am, 6 am and 8 am were measured. Results The lOP was higher in POAG patients with high myopia over those POAG alone in three ways： the elevated lOP value was 0.65 mmHg measured in single time lOP at 10 am, 0.84 mmHg in mean corrected 24-hour lOP, 0.97 mmHg in mean corrected night lOP. The 24-hour lOP fluctuation was lower in the two myopia groups than in non-myopia group. Further, using repeated measurement analysis of variance, there was no statistical significance among groups regarding the lOPs at the seven time points （P=0.77） and there was no interaction between groups and time points （P=0.71）, but the difference of lOPs at the seven time points in same group was statistically significant （P=0.01）. Conclusion High-tension POAG patients with high myopia, even on pharmacological glaucoma therapy, still have hinhe.r IC）P. h^Jt 24-hnur IC）P fluc.tuatinn at re.qtina ~.nnditinn.q wA.q InwAr in th~..~, n^ti~.nt.q

The influence of substrate and atmosphere on the properties of FeSiB(Cu,Nb) alloy melts

The surface tensions and contact angles of Fe_(78)Si_9B_(13) and Fe_(73.5)Cu_1Nb_3Si_(13.5)B_9 alloy melts were studied as a function of temperature in various atmospheres(vacuum, Ar and N_2 gas) and on different substrates(Si C, Al_2O_3 and BN). It is indicated that Si_3N_4, NbN, Fe_2 Al B and B_(13)C_2 are generated as new phases at the interface between the melt and substrate, and reactive wetting behaviour exists during the heating process. The surface tensions of two alloy melts on BN substrate both firstly decrease and then increase along with increasing temperature, leading to V-shaped surface tension versus temperature, which results from atomic diffusion effects in the surface layer during the oxidation of BN and formation of C-rich layer. Comparably, the surface tensions on Al_2O_3 and Si C substrates decrease with increasing temperature throughout the entire temperature range. Among three substrates, BN exhibits the mildest wetting behaviour. The vacuum environment has the strongest protective effect on melt stability among the tested atmospheres. These findings enrich our knowledge about the effects of the substrate and atmosphere on Fe-based alloy melts at a high temperature, and provide theoretical reference for designing jet nozzles in melt-spinning techniques.