Papers by Keyword: Ophthalmology

Abstract: Several are the instrumental tests currently available in the diagnosis of retinal diseases. Their outputs are typically images of anatomical portions of the eye. However, these are useful to highlight only few aspects of the characteristic lesions of the occurring pathology. For this reason, the clinician needs to have tools able to perform comparative analysis of the different diagnostic images by using procedures of integration of the different clinical information contained in each of them. In this paper, we will describe a new medical software tool (MicroRetina) tailored for the comparative analysis of images of the fundus oculi, acquired during diagnostic tests that make use of different medical instruments. The developed software is an open system able to manage images acquired by different instruments and it will be able to give a helpful support to one of the existing problem in performing diagnosis by using images of the fundus oculi. In particular, it will allow the clinician to perform in real time the comparative analysis of the different clinical findings allowing him to have further diagnostic information not otherwise available by the analysis of the single images only.

Abstract: In optometry, simplified models are usually used to analyze refractive property of optometry system on the assumption that lenses are thin and close enough to each other. However, in fact those lenses do have stated center thickness and lens space between them. The simplified models are not suitable for accurate analysis and system design. In this paper, first, accurate mathematic model for refractive property of single spherical and cylindrical lens is established. Next, accurate model is established for complex optometry system with different kinds of lenses combination. Then, influence factors such as lens structural parameter, lens space and lens position are analyzed for refractive property. Results show that correct lens position is very important for complex optometry system. Parallel light should pass lower power lens first and then higher power lens. When lens power and lens space gets bigger the influence of lens space will be more significant on refractive property. For uncertainty component, uncertainty from front and back surface radii are the biggest, secondary is the refractive index and lens space, and uncertainty from lens thickness is the least.

Abstract: Zirconia-alumina ceramic foam scaffolds with a nanocrystalline HAP coating were used for the preparation of integrated motile orbital implants. This study demonstrated that open-cell ceramic foams with enhanced strength-to-density ratio are quite suitable as biocompatible materials for the manufacture of orbital implants for post-enucleation syndrome treatment. In-vivo studies demonstrated that the application of a nanocrystallyne (not sintered) HAP coating facilitated the formation of dense fibrous capsule around the implant as well as the fast tissue ingrowth into the implant’s internal space. Orbital implants with the optimized pore size and HAP content were implanted to the animal’s eye cavity with their fixation to the extraocular muscles, and their motility was ensured.