排序方式: 共有25条查询结果,搜索用时 0 毫秒
21.
22.
《Contact lens & anterior eye》2019,42(2):216-219
PurposeTo explore the relationship between intraocular pressure (IOP) measurements and topographical variations in corneal curvature and corneal thickness in a cohort of keratoconic patients presenting to a newly-established regional Keratoconic diagnostic and monitoring clinic in Northern Ireland.MethodsIOP was recorded, using a hand held ICARE tonometer, at central, nasal and temporal locations on keratoconic corneae of 27 consecutive patients attending clinic. Pachymetry and sagittal keratometry were recorded in matched locations using the Pentacam Topographer. Eyes with history of corneal surgery or anterior surface pathology were excluded.ResultsThe median (interquartile range) central keratometry, pachymetry (CCT) and IOP measurements for 49 eyes were 44.1D (42.2D–48.1D); 495 μm (460 μm–526 μm); 10 mmHg (8 mmHg–13 mmHg) respectively. Temporal and nasal keratometry, pachymetry, and IOP values, recorded on midline, were temporal 41.9D (40.7D–42.8D); 621 μm (579 μm–650 μm); 14 mmHg (11 mmHg–16 mmHg); nasal 40.8D (39.5D–42.5D); 641 μm (599 μm–698 μm); 13 mmHg (12 mmHg–17 mmHg). A moderate correlation was shown between reduction in CCT and increase in mean central keratometry (Spearman’s Coefficient (ρ) −0.72 P = 0.00). A moderate correlation was found between reduction in CCT and reduction in IOP, as recorded centrally (ρ = 0.37 P = 0.01). Mid-peripheral values demonstrated similar trends in the relationship between keratometry and IOP (nasal ρ = −0.47 P = 0.00; temporal ρ = −0.38 P = 0.00) and pachymetry and IOP (nasal ρ = 0.29 P = 0.05; temporal ρ = 0.33 p = 0.02).ConclusionIn this pilot study, a positive correlation exists between pachymetry, keratometry and IOP. Topographically variations in intraocular pressure mimic changes in keratometry and pachymetry. 相似文献
23.
在数字电视中,经常需要流媒体播出。以PLX公司PLX IOP480PCI芯版为核心,外加CPLD、SRAM/SFIFO、SDRAM、DSP、PLL等器件,可构成一种新型播出录制卡,这种播出卡在软件系统控制下,可实现SPIS流板上再复用播出、MPTS播出、动态数据插入、输出码率可调,实时TS流的录制等功能。 相似文献
24.
25.