PURPOSE To determine whether optical coherence tomography (OCT) epithelial mapping can improve the detection of form fruste keratoconus. SETTING French National Eye Hospital, Paris 6 Pierre & Marie Curie University, Paris, France. DESIGN Retrospective comparative study. METHODS Eyes with normal corneas, form fruste keratoconus, moderate keratoconus, or severe keratoconus were assessed usi...

OBJECTIVE To determine the activity of paraoxonase 1 (PON1) in keratoconus in a Malaysian population in comparison with non-keratoconic subjects. METHODS Clinical eye examinations were performed on patients with keratoconus and non-keratoconic subjects after questionnaires were completed. Blood samples were collected and subjected to spectrophotometric analysis of paraoxonase and diazoxonase ...

Higher-order aberration correction in abnormal eyes can result in significant vision improvement, especially in eyes with abnormal corneas. Customized optics such as phase plates and customized contact lenses are one of the most practical, nonsurgical ways to correct these ocular higher-order aberrations. We demonstrate the feasibility of correcting higher-order aberrations and improving visual...

Corneal hysteresis (CH) is a parameter which measures the viscoelastic behaviour of the cornea, indicating its biomechanical integrity1. Some clinical conditions such as keratoconus, Fuchs corneal dystrophy, high myopia, glaucoma and corneal refractive surgery, may induce changes in corneal biomechanical properties, leading to a decrease in CH2-6. Astigmatism, a refractive error related to corn...

purpose: to compare the clinical outcomes following deep anterior lamellar keratoplasty (dalk) for keratoconic patients with vernal keratoconjunctivitis (vkc) and without vkc. methods: in this retrospective comparative study, the records for 262 eyes with keratoconus only (group 1) and 28 keratoconic eyes with vkc (group 2) that underwent dalk were complied. the parameters reviewed included the...

PURPOSE To assess the changes in visual acuity and topographic indices after implantation of single-segment Intacs. METHODS Forty-two keratoconic eyes received Femtosecond-assisted single-segment Intacs. Uncorrected distance visual acuity (UDVA) and best spectacle corrected visual acuity (BSCVA), refractive error, keratometry (K1, K2, Km, and KMax.), and seven Pentacam measured topographical ...

Purpose: To compare clinical outcomes following penetrating keratoplasty (PK) versus deep anterior lamellar keratoplasty (DALK) for keratoconic patients with vernal keratoconjunctivitis (VKC). Methods: In this retrospective comparative study, the records of 69 keratoconic eyes with VKC that underwent PK (n=43, group 1) or DALK (n=26, group 2) were compiled. Postoperative best-corrected visual a...

Purpose. To develop a mathematical tool for decomposition of comeal topographic data into comprehensive optical components. Methods. The polar data values arising from each mire of the TM>1 cornea1 topographer were separated into spherical (average power), regdar astigmatic (2’ harmonic), and non-regular astigmatic components (l’, 3’, and higher harmonics) by Fourier series analysis. Averages o...