View clinical trials related to Keratoconus.
Filter by:The goal of the study is to examine the effects of custom front-surface wavefront correction on visual performance, and on neutralization of higher order aberrations, in patients wearing a scleral lens device. The investigators will study patients with keratoconus, the most common type of corneal ectasia, who have already been fitted with the BostonSight BSS (Boston Sight Scleral) for improved visual function.
To evaluate two different techniques of cross linking: standard epithelium off (CXL epi off) versus trans-epithelial (CXL epi on) cross linking in patient with progressive keratoconus.
Young patients with keratoconus face two problems: disease progression and corneal shape irregularity. Both underlie the 20% rate of corneal transplantation in keratoconics required to maintain useful vision. Corneal collagen cross-linking (CXL) is a now the gold-standard treatment to halt disease progression. The aim is to strengthen the cornea to prevent further shape deterioration. For patients whose quality of vision has already suffered, standard CXL can generally only prevent further deterioration, rather than improving vision. Refractive CXL, a new iteration of CXL in which a bespoke treatment pattern is applied to the cornea, aims to smooth out surface irregularities thereby improving vision. This primary objective of this study is to compare the visual outcome in patients with progressive keratoconus treated with refractive CXL, as compared with historical controls treated with standard CXL.
The purpose of this study is to assess the reliability and repeatability of the parameters obtained using the Galilei dual-scheimpflug corneal topographer for monitoring progression in eyes with keratoconus.
Certain studies reported that cigarette by-products may make the cornea more rigid, suggesting that it could lead to "natural" CXL of collagen fibers, hence a protective effect for KC. Others have reported that cigarette smoking causes no significant changes in the corneal biomechanics. The aim of this study was to assess a possible link between keratoconus (KC) occurrence and patients' smoking habits.
To evaluate the safety and efficacy of epithelium-on corneal collagen cross-linking (CXL) in impeding the progression of, and/or reducing corneal curvature (Kmax) in eyes with progressive keratoconus. Epithelium-on CXL uses a formulation that allows the riboflavin to penetrate the cornea without the need to remove the epithelium, the outer most layer of the cornea.
The investigators aim to investigate the effects of combined corneal wavefront-guided transepithelial photorefractive keratectomy (tPRK) and accelerated corneal collagen cross-linking (CXL) after intracorneal ring segment (ICRS) implantation in patients with moderate keratoconus. Medical records of 23 eyes of 23 patients undergoing combined tPRK and CXL after ICRS implantation were retrospectively analyzed. 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), and corneal biomechanical properties were evaluated before and after ICRS implantation, and at 1, 3, and 6 months after combined tPRK and CXL. Corneal biomechanical properties were measured using the dynamic Scheimpflug analyzer at approximately the same time of day.
patients with keratoconus in one eye and forme fruste keratoconus in the fellow eye compared to normal subjects .the patients were examined by schemipflug imaging system (Pentacam)
Epithelium-On Corneal Crosslinking for 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