Subsequent damage to PSII might be the reason for the slow, or lack of recovery, for most of the parameters measured. (C) 2011 Elsevier Masson SAS. All rights reserved.”
“Write margin analysis of the bit patterned media (BPM) was experimentally carried out using a static tester. Sample BPM were fabricated from hard/soft-stacked (exchange-coupled composite; ECC) base media with a Pt/Co multilayer hard layer and a Co soft layer. Write
margins of 60-nm-dot (140 nm period) and 40-nm-dot (100 nm period) media were confirmed to be 80 nm and 50 nm, respectively. An analysis of the margin loss factor found a large residual margin loss. The loss factors of 60-nm-dot and 40-nm-dot media were 57 nm and 44 nm, respectively, and these values almost correspond to the dot diameter. The residual margin loss was identified Selleck GM6001 as due to the formation of a multi-domain structure within some dots under certain recording conditions. (C) 2011 American Institute of Physics. [doi:10.1063/1.3554201]“
“PURPOSE: To compare anterior chamber parameters in normal eyes and eyes with mild to moderate keratoconus corneas using rotating
Scheimpflug imaging and evaluate trends in corneal protrusion progression.
SETTING: Department of Ophthalmology, Semmelweis University, Budapest, Hungary.
METHODS: The anterior chamber depth (ACD) at the corneal center, thinnest point of the cornea, and 1.0 mm, 2.0 mm, and 3.0 mm paracentrally; central pachymetry; and posterior elevation were check details measured by Scheimpflug imaging (Pentacam) in eyes with keratoconus and eyes of refractive surgery candidates. A generalized estimating equation (GEE) was used to identify predictors
of keratoconus. Correlations between posterior elevation and ACD at minimum pachymetry were analyzed by linear and piecewise linear regression.
RESULTS: The keratoconus group comprised 41 eyes (24 patients) and the control group, 70 eyes (41 patients). The ACD was significantly deeper in the keratoconus group than in the control group (P<.05) Crenigacestat and was significantly correlated with posterior elevation. In the multivariable GEE model, posterior elevation (odds ratio [OR], 1.46; P<.001) and ACD at minimum pachymetry (OR, 7.54; 95% confidence interval, 1.35-42.05) were significant predictors of keratoconus. Segmented analysis of the correlation between posterior elevation and central ACD showed a better fit to data than linear regression and identified a 40 mu m threshold level for posterior elevation. The GEE determined 450 mu m as a similar threshold for central corneal thickness.
CONCLUSION: There was a threshold level of posterior corneal elevation and corneal thickness values beyond which the level of corneal protrusion in keratoconus accelerated.