Clinical Evaluation of Large Diameter Rigid-Gas Permeable Versus Soft Toric Contact Lenses for the Correction of Refractive Astigmatism. A MultiCenter Study.

Purpose: This study aims to address the clinical performance of a large diameter rigid gas permeable lens (LRGP) in a group of subjects with low-to-moderate (0.75-2.75 D) refractive astigmatism.

Macular pigment optical density spatial distribution measured in a subject with oculocutaneous albinism.

Purpose: Previous studies of macular pigment optical density (MPOD) distribution in individuals with oculocutaneous albinism (OCA) have primarily used objective measurement techniques including fundus reflectometry and autofluorescence. We report here on a subject with OCA and their corresponding MPOD distribution assessed through heterochromatic flicker photometry (HFP).

Methods: A subject with a history of OCA presented with an ocular history including strabismus surgery of the LE with persistent amblyopia and mild, latent nystagmus.

A comparison of the short-term settling of three scleral lens designs.

Purpose: Scleral gas-permeable lenses are rapidly gaining international popularity. Unlike corneal gas-permeable lenses, scleral lenses are fitted to the bulbar conjunctiva and settle into the tissue after insertion. To date, we are unaware of any studies examining the settling behavior of three varying scleral lens designs.

Central serous chorioretinopathy produces macular pigment profile changes.

Purpose: Macular pigment (MP) is the collective name for three isomeric carotenoids: lutein, zeaxanthin, and meso-zeaxanthin. Macular pigment density is greatest in the central retina, peaking at the fovea and falling to negligible levels at 7 degrees of eccentricity from the fovea. Several studies have documented the interocular symmetry of MP optical density (MPOD) spatial distribution.

Contact lens correction of presbyopia.

The contact lens wearing presbyopic population is underserved worldwide. There are several available options, including single vision contact lenses and spectacle over-correction for near, monovision, rigid gas permeable (GP) multifocal and bifocal lens designs and soft bifocal lens designs. This paper presents an overview of the latest research and clinical experience as it pertains to these forms of correction.

Use of clinical practice guidelines by executive directors of optometric associations.

Background: The process of developing the American Optometric Association's (AOA) Optometric Clinical Practice Guidelines began in 1989 under the direction of John F. Amos, O.D.

Gas permeable toric use and applications: survey of Section on Cornea and Contact Lens Diplomates of the American Academy of Optometry.

Background: The purpose of this study was to survey Diplomates in the Section on Cornea and Contact Lenses of the American Academy of Optometry (AAO) to determine their fitting preferences for astigmatic patients, lens materials used, and their perception of simplicity or complexity of bitoric fitting.

Methods: A total of 180 practitioners, representing all active Diplomates in the Cornea and Contact Lens Section, were sent a survey of 11 questions pertaining to their astigmatic contact lens prescribing habits. Sixty-eight (38%) of those surveyed responded to the questionnaire.

Longitudinal changes in visual acuity in keratoconus.

Purpose: The present investigation aimed to identify factors that predict reduced visual acuity in keratoconus from a prospective, longitudinal study.

Methods: This report from the Collaborative Longitudinal Evaluation of Keratoconus (CLEK) Study used 7 years of follow-up data from 953 CLEK subjects who did not have penetrating keratoplasty in either eye at baseline and who provided enough data to compute the slope of the change over time in high- or low-contrast best-corrected visual acuity (BCVA). Outcome measures included these slopes and whether the number of letters correctly read decreased by 10 letters or more in at least one eye in 7 years.

Endothelial response to overnight corneal reshaping.

Purpose: To discuss corneal endothelial structure during different environments. Little information has been available on the structure of the corneal endothelium during overnight corneal reshaping.

Method: Patients were selected to represent different environments of contact lens wearing to contrast them to patients who changed their environment from contact lens use to overnight corneal reshaping.