PURPOSE To assess the effects of soft contact lens base curve radius (BCR), sex, ethnicity, central corneal curvatures, and vertical palpebral aperture size (PAS) on the postlens tear thickness (PLTT). METHODS The PLTT was measured using optical pachometry on 114 experienced lens wearers who were fitted with lathe-cut soft lenses (Alden 47, polymacon, 35.5% H2O, -2.00 diopter, and 14.0 mm). E...

Microorganisms, especially gram-negative bacteria, are considered to play a role in the etiology of certain corneal infiltrative events (CIEs) observed during soft contact lens wear. This study explored the possibility of microbial colonization of soft contact lenses as a risk factor leading to CIEs. In a clinical trial conducted from March 1993 to January 1996, 330 subjects wore disposable sof...

A Shack-Hartmann aberrometer was used to assess the optical performances of eyes corrected with rigid or soft contact lenses compared with spectacles. Metrics of optical quality derived from the measured wave aberrations were consistent with the subjective rating of visual clarity by subjects. Optical aberration analysis illustrated the differences in aberration structures of eyes wearing diffe...

The use of contact lenses (CLs) has been widely associated with corneal alterations that range in symptomatology and severity. Lesions may vary from small peripheral sterile infiltrates to infectious central ulcers with sight-threatening potential. Contact lens wear has been described as the most important predisposing factor to microbial keratitis worldwide. Infections are more frequent in sof...

PURPOSE To assess the repeatability and reliability of IOLMaster (Carl Zeiss Meditec, Inc., Dublin, CA) axial length and keratometry measurements (K readings) with a soft contact lens on normal eyes. The method is designed for eyes with corneal irregularities or after endothelial keratoplasty. METHODS Biometry was performed on 20 healthy right eyes of volunteer subjects with mean age, 27.3 +/...

PURPOSE To describe the epidemiology of children submitted to contact lens fit. METHODS Retrospective study of 73 children that had been submitted to contact lens fit at the "Universidade Federal de São Paulo". This study analyzed sex distribution, age, diagnosis, indications and contact lens fitted at first examination. RESULTS 34 children (46.6%) were male and 39 (53.4%) female, aged betw...

PURPOSE We evaluated the usefulness of commercially available materials for protecting the cornea from drying during vitrectomy with a wide-angle viewing system. METHODS THREE VITREORETINAL SURGEONS EVALUATED FUNDUS VISIBILITY DURING VITRECTOMY ON THE IMAGES OF FIVE STUDY MATERIALS USED ON THE CORNEA: balanced saline solution, a viscoelastic agent, a vitrectomy contact lens, a rigid gas perme...

PURPOSE To analyze the indications, type and complications of contact lens use and visual acuity in children, in ophthalmological, public and private, services. METHODS The information from the medical records of 59 contact lens users at a private service (Hospital de Olhos de Pernambuco - Recife - PE- Brazil - group 1), and 43 at public service (Fundação Altino Ventura - Recife - PE - Brazil...

he controversy and confusion regarding the mechanism of presbyopia results in large part from an inability to directly measure the anatomical structures in question. In this study, magnetic resonance imaging (MRI) has been used to directly detect age related changes in circumlental space of 47 emmetropes and mild myopes. MRI offers unparalleled soft tissue contrast, providing differentiation be...