View clinical trials related to Keratoconus.
Filter by:To compare repeatability, reproducibility and agreement of both, AS- OCT and Scheimpflug imaging, for the measurement of corneal curvature and corneal thickness in patients with keratoconus.
Background: Keratoconus leads to gradual progressive loss of vision in young and adult patients. For visual rehabilitation and to hinder keratoconus progressionthe investigators designed this study to help the keratoconus patients to improve and stabilize their vision. Design: This is a prospective consecutive uncontrolled study. Patients and Methods: This study includes 36 eyes of 36 patients with moderate degree o keratoconus (KC) undergoing combined wave front guided transepithelial photorefractive keratectomy (TPRK) and accelerated corneal collagen crosslinking (ACXL) after intracorneal ring segment (ICRS) implantation. Uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), manifest refraction spherical equivalent (MRSE), corneal indices based on Scheimpflug tomography, higher-order aberrations (HOAs) will be evaluated at baseline, after ICRS implantation, and at1, 3, 6, and 12 months after combined TPRK and CXL.
Hormonal imbalances are likely to affect the corneal metabolism and may be also associated with Keratoconus. Among the various endocrinologic dysfunctions assumed so far, thyroid gland dysfunction (TGD) (hypo- or hyperthyroidism; comprised as TGD) is frequently associated with eye diseases such as Graves disease
It is aimed to investigate the role of supplemental systemic oxygen therapy during accelerated corneal collagen crosslinking (CXL). In this prospective randomized clinical trial, patients with progressive keratoconus who are candidates for receiving CXL will be included. The patients will be randomized and allocated to three different CXL protocol. In the first group (OA-CXL), CXL is performed using an accelerated protocol (9 mW/ CM2 for 10 minutes) in addition to the delivery of systemic oxygen with a rate of 5 liters/min through a nasal mask for 10 minutes during UV-A ablation. Patients in the second group (A-CXL) will receive CXL with the same accelerated protocol without additional oxygen therapy. Conventional CXL using 30 mW/CM2 UV-A ablation for 30 minutes is perfomed in the patients of the third goup (C-CXL). Maximum keratometry in Sirius corneal tomography as the primary outcome and uncorrected and corrected distance visual acuity (UDVA, CDVA) and corneal biomechanical properties including corneal resistance factor (CRF) and corneal hysteresis (CH) as secondary outcome measures are followed for a six- and 12-months period. A P-value of less than 0.05 is considered as statistically significance level.
The objective of this study was to identify and build an algorithm through an imaging process using a support vector machine (SVM) with the tomography variables of cases with, KC, highly susceptible corneas to ectasia (HSCE), and healthy corneas and to compare this algorithm to BAD-D (Belin_Ambrosio Display) and PRFI (Pentacam Random Forest Index). The study included 148 eyes with KC, 351 with healthy corneas, and 88 eyes with HSCE.
By measuring and comparing the corneal biomechanical parameters of normal people, patients with allergic conjunctivitis, keratoconus, whether allergic conjunctivitis causes changes in corneal biomechanics can be explored, and sensitive mechanical indicators of allergic conjunctivitis can be identified. Furthermore, through rubbing frequency, ocular allergic symptom scores and physical sign scores observation, corneal morphological parameters, corneal epithelial thickness, tear inflammatory cytokines levels, and conjunctival microvascular parameters measurements, related factors affecting corneal biomechanics in patients with allergic conjunctivitis can be identified. Otherwise, by comparing corneal biomechanical changes in vernal keratoconjunctivitis before and after drug treatment, biomechanical change tendency during treatment can be clarified.
The purpose of this study is long-term follow up of patients with corneal diseases to analyze the quality of surgical interventions and diagnosis. Corneal ectasia, especially keratoconus, is a corneal disease that leads to an irreversible loss of visual acuity while the cornea becomes steeper, thinner and irregular. For these patients, surgical intervention (e.g. corneal cross-linking) is performed, in case of disease progression. Overall, a long-term follow up is needed to evaluate an early disease progression as well as corneal stability after surgical intervention.
Evaluate the illness experience of patients with keratoconus as well as the rubbing habits of this population compared to the general population. To do this, the investigators used a questionnaire made by a Bordeaux team with questions on the experience of the patients' illness, their management and their friction habits
To evaluate the safety and effectiveness of the PXL Platinum 330 device for performing Corneal Crosslinking in patients with corneal thinning conditions.
To determine whether the Peschke PXL-330 is safe and effective in the treatment of corneal thinning conditions.