Active clinical trials for "Keratoconus"

The principal objective of this study is to evaluate the frequency of KC inside family of patients with confirmed KC. It's a familial, epidemiological, prospective, single-center study.

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

Comparison of repeated WaveLight Analyzer and Alcon LadarWave measurements in phakic and pseudophakic eyes.

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.

The OCT used in this trial offers the advantage of both a non-contact method and a very high axial resolution. Determined parameters with the highest potential of diagnostic discrimination between eyes with Keratoconus and healthy eyes are investigated. Aim of this trial is to investigate differences of specific parameters of epithelium thickness maps at healthy eyes and eyes with Keratoconus.

The purpose of this study is to create a database of keratoconic eyes with two or more corneal topographies/tomographies, at least 5 months apart

Corneal stromal thinning observed in keratoconic eyes could result from an increased synthesis of MMP at the level of the anterior stroma and the corneal epithelium induced by an overexpression of the Extracellular Matrix Metalloproteinase Inducer (EMMPRIN) and Galectin-3 by epithelial cells. A differential expression of EMMPRIN, Galectin-3 and metalloproteinases (MMP) may be observed between the apex of the keratoconus and the peripheral cornea. Highlighting the implication of EMMPRIN and Galectin-3 could lead to the development of specific inhibitors to slow or to stop keratoconus evolution.

The follow up time after keratoplasty now routinely exceeds multiple decades. It is common for keratoplasty patients to also undergo cataract surgery at a later date in their lives. Keratoplasties and cataract surgery both result in local inflammation. This may influence the density of endothelial cells, and on average there is a loss of 10% in endothelial cells within 3 months of the cataract surgery. Yet, a sufficient density of endothelial cells is required to maintain graft transparency. It may be therefore difficult to strike a balance between loss of visual acuity due to the cataract of to the loss of graft transparency over the long term. The investigators aim to compare graft survival in patients with clear crystalline lens with and without cataract surgery.

Primary objective of this study was to evaluate the diagnostic capability of keratoconus match index (KMI) and keratoconus match probability (KMP) indexes in forme fruste keratoconus (FFK), and their association with a series of Pentacam-derived keratconus (KC) indexes. KMI and KMP parameters are KC-specifc indexes that are measured by Ocular Response Analyzer (ORA), based on the distinct ORA-derived waveform characteristics of KC eyes. Study participants were recruited from the Cornea Outpatient service in a consecutive if eligible basis. Two study groups were formed: a) FFK group (FFKG) that included patients diagnosed with FFK, and, b) Control group (CG) was formed by refractive surgery candidates. All ORA (Reichert Ophthalmic Instrument, Buffalo, NY, USA, software version: 3.01)and Pentacam (Pentacam HR, Oculus Optikgerate GmbH, Heidelberg, Germany)measurements were performed by the same experienced operator in a consistent way

Primary objective of this study was to assess the intrasession, intersession and interobserver variability of the Pentacam-derived posterior corneal elevation measurements in keratoconus eyes and eyes that underwent Corneal Collagen Cross-liknking (CxL) treatment due to progressive keratoconus.