We show that the wave functions form caustics in circular graphene p-n junctions which in the framework of geometrical optics can be interpreted with a negative refractive index.
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Broadband Long Wavelength Light Promotes Myopic Eye Growth and Alters Retinal Responses to Light Offset in Chick.
Invest Ophthalmol Vis Sci
January 2025
School of Psychology and Public Health, La Trobe University, Melbourne, Australia.
Purpose: Prolonged exposure to broadband light with a short-wavelength (blue) or long-wavelength (orange/red) bias is known to impact eye growth and refraction, but the mechanisms underlying this response are unknown. Thus, the present study investigated the effects of broadband blue and orange lights with well-differentiated spectrums on refractive development and global flash electroretinography (gfERG) measures of retinal function in the chick myopia model.
Methods: Chicks were raised for 4 days with monocular negative lenses, or no lens, under blue, orange, or white light.
Severe Microbial Keratitis in Virgin and Transplanted Cornea-Probability of Visual Acuity Improvement.
J Clin Med
December 2024
Department of Ophthalmology, Medical University of Warsaw, Sierakowskiego 13, 01-756 Warsaw, Poland.
To evaluate visual acuity improvement and identify contributing factors in patients with severe keratitis affecting both virgin and transplanted corneas, treated at a hospital. A retrospective analysis was conducted on 497 patients with unilateral corneal ulcers treated at a tertiary referral center between 2008 and 2023. Data included distance (BCVA) and near best-corrected visual acuity at initial presentation and at discharge, treatments before hospital admission, demographic details, risk factors, clinical signs and symptoms, ancillary test results, and management strategies.
View Article and Find Full Text PDFOrientation-dependent photonic bandgaps in gold-dust weevil scales and their titania bioreplicates.
Beilstein J Nanotechnol
January 2025
Department for Chemistry and Physics of Materials, University of Salzburg, Jakob-Haringer-Str. 2a, 5020 Salzburg, Austria.
The scales of the gold-dust weevil are green because of three-dimensional diamond-type chitin-air photonic crystals with an average periodicity of about 430 nm and a chitin fill fraction of about 0.44. A single scale usually contains one to three crystallites with different lattice orientations.
View Article and Find Full Text PDFThe Associations Between Myopia and Fundus Tessellation in School Children: A Comparative Analysis of Macular and Peripapillary Regions Using Deep Learning.
Transl Vis Sci Technol
January 2025
Department of Ophthalmology, The First Affiliated Hospital with Nanjing Medical University, Nanjing, China.
Purpose: To evaluate the refractive differences among school-aged children with macular or peripapillary fundus tessellation (FT) distribution patterns, using fundus tessellation density (FTD) quantified by deep learning (DL) technology.
Methods: The cross-sectional study included 1942 school children aged six to 15 years, undergoing ocular biometric parameters, cycloplegic refraction, and fundus photography. FTD was quantified for both the macular (6 mm) and peripapillary (4 mm) regions, using DL-based image processing applied to 45° color fundus photographs.
Compartmental analysis of retinal vascular parameters and thickness in myopic eyes using SS-OCTA.
Front Med (Lausanne)
December 2024
Chongqing Key Laboratory of Prevention and Treatment on Major Blinding Diseases, Chongqing Eye Institute, Chongqing Branch (Municipality Division) of National Clinical Research Center for Ocular Diseases, The First Affiliated Hospital of Chongqing Medical University, Chongqing, China.
Article Synopsis
- The study examined how myopia affects the thickness and structure of retinal blood vessels using advanced imaging technology in 100 participants.
- The findings revealed that individuals with high myopia had significantly lower vessel density and thinner retinal layers, particularly noticeable in the superficial and nerve fiber layers.
- There was a noted correlation between certain ocular parameters, such as axial length to curvature radius ratio, and retinal thickness in non-high myopic eyes, while high myopic eyes showed less correlation in these aspects.
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