View clinical trials related to Corneal Diseases.
Filter by:The aim of this pilot study is to assess the ability of a new optical coherence tomography system to obtain information on biomechanics of the cornea.
The most common causes for irregular cornea (IC) in hospital contact lens practice are Keratoconus (KC) and related cornea thinning disorders. These conditions cause mild to marked impairment of vision and cannot be effectively corrected by spectacles and soft contact lenses. The gold standard in the management of KC is Corneal Rigid Gas Permeable contact lenses (corneal lenses), which correct approximately 90% of the corneal irregularity. Compared with a normal cornea, the cornea in KC is irregular and this results in a compromise to the fit of rigid corneal lenses. Specifically, they bear on the cornea and this, together with the vulnerability of the cornea in KC, are implicated in corneal scarring, and disease progression as well as a significantly reduced vision related quality of life (QoL) in KC compared with corneal lens wearers who have no KC. In cases where the compromise fit of corneal lenses proves problematic, large diameter Scleral RGP contact lenses (scleral lenses) may be used as a problem solver. Unlike the smaller corneal lenses which bear on the cornea, the scleral lenses completely bridge over the cornea and bear on the sclera. The aim of this research is to investigate the performance of scleral lenses in KC participants who habitually wear corneal lenses. The research question: is there a measurable difference in the visual performance and visual quality of life in participants with Irregular cornea disorders like keratoconus and other related conditions, who habitually wear corneal lenses in comparison with scleral lenses.
In vivo confocal microscopy (IVCM) used in tertiary care ophthalmology centers is performed with two reflectance microscopes attached on a mounting with limited movement along the XYZ axes. Consequently, ocular diseases in the central area have been described (mostly cornea and adjacent conjunctiva). Two dermatology IVCM (an handheld small IVCM and a multifluorescent one) present significant innovations that the investigators want to assess in ophthalmology for the diagnosis of conjunctiva, cornea, eyelid and lachrymal tract diseases. The handheld IVCM have unlimited degrees of freedom and a small diameter objective. It could dramatically increase the area accessible to IVCM (whole conjunctiva, eyelids, proximal lachrymal tract) (part 1 of the present study). The fluorescent IVCM allows the use of a wide range of fluorescent markers liable to increase the specificity of the diagnosis by revealing staining patterns corresponding to a specific disease and not to others (part 2 of the study)
60% of the patients hospitalized in intensive care and sedated suffer from insufficient inferior eyelid occlusion. Thus, they are at risk for corneal damage (estimated risk 20% to 57%). The prevention of such corneal damage can be done using several techniques (artificial tears, eyelid occlusion dressing, aqueous gel). The efficacy of these techniques has never been compared in a rigorous study. Therefore it is not yet possible to determine an evidence-based strategy to prevent corneal damage in intensive care patients. This study aims at assessing the efficacy of primary prevention of corneal lesions in intensive care patients, in order to elaborate an evidence-based nursing protocol.
1. To compare the corneal epithelial defect healing time between diabetic patients receiving and not receiving supplementary oxygen after vitrectomy. 2. To determine whether factors such as age, duration of diabetes, duration of surgery and level of glycemic control have any influence on corneal epithelial wound healing time in diabetic patients receiving and not receiving supplementary oxygen post-vitrectomy.
To evaluate the clinical effect of combination of topical 20% (v/v) autologous serum eye drops and a silicone-hydrogel contact lens (CLs) in the treatment of recalcitrant persistent epithelial defects (PEDs) and the recurrence rate of epithelial breakdown with or without continued use of autologous serum eye drops.
The purpose of this study is to asses the agreement of the RS-3000 Lite and RS-3000 Advance to the RS-3000, assess the crossed precision of each study device and to assess the transference of a reference database from the RS-3000 to the RS-3000 Lite and to the RS-3000 Advance.
The purpose of this study is to determine if the 3-year graft failure rate following endothelial keratoplasty performed with donor corneas with a preservation time of 8 to 14 days is non-inferior to the failure rate when donor corneas with a preservation time of 7 or fewer days are used.
The primary objective of this clinical study is to compare the Nidek RS-3000 Optical Coherence Tomography (OCT) device to the Optovue RTVue OCT. The secondary objective is to evaluate any adverse events found during the clinical study.
The objective of this study is to evaluate the ease of use of a modified, disposable contact lens and suction ring assembly.