Contact Lens Prescription Research Articles

The operational and regulatory environment of contact lenses

This paper discusses the operational and regulatory factors surrounding contact lens usage. These operating environments primarily effect three organizations: manufacturers, clinicians, and consumers. The interaction of these factors ultimately impact the availability, use, and prescription of contact lenses. An understanding of these factors can help the clinician better evaluate new lens modalities.

Contact Lens Practice

Part 1 History: origin of the contact lens, Anthony Sabbell. Part 2 Material technology: chemical composition & properties, Miguel Refojo oxygen transport through contact lenses, William Benjamin mechanical properties, Ronald E. Stephenson. Part 3 Contact lens design technology: contact lens design, Michel Guillon and William Sammons soft contact lens kinetics, Yoshizo Kikkawa contact lens optics, Colin Fowler quality assurance and quality control for volume lens manufacturing, Stewart Gibson quality control of rigid lenses in clinical practice, Richard Pearson the verification of soft lenses in clinical practice, Michael Port manufacturing standards, Michael Sheridan. Part 4 Anatomical & physiological factors: microscopic anatomy and ultra structure of the cornea, conjunctiva and lids, Ramesh Tripathi, et al innervation of the anterior segment, Gordon Ruskell corenal physiology & biophysics, Stephen Kwok biochemical aspects of the cornea, Barry Masters. Part 5 Clinical techniques: keratometry & specialist optical instrumentation, Ronald Rabbetts photokeratoscopy & corneal topography, Arthur Ho and Michel Guillon biomicroscopy, Steve Zantos and Ian Cox pachometry - clinical & scientific applications, Tailoi Chan and David Pye aesthesiometry, Michel Millodot the role of tears in contact lens performance and its measurement, Jean-Pierre Guillon oxygen consumption & measurements, Richard Hill. Part 6 Practical routine: indications and contraindications for contact lens wear, Barry Weissman preliminary examination patient selection, Barry Weissman contact lens care systems and solutions used by the practitioner, Fiona Stapleton & Judith Stechler symptomology and aftercare, Joshua Joshephson, et al. Part 7 Fitting techniques: basic contact lens fitting, Michel Guillon fitting the astigmatic patient with rigid contact lenses, Theodore Grosvenor toric hydrogel contact lenses, Nigel Burnett Hodd and Joshua Josephson tinted hydrogel contact lenses, Richard Weisbarth the scleral regid lens - optical and therapeutic applications, Montague Ruben gas permeable scleral contact lenses, Oliver Schein, et al presyopia and influence of ageing on the prescription of contact lenses, William Benjamin and Irving Borish contact lenses for children, David Taylor and Judith Morris. Part 8 Abnormal and therapeutic fitting: correction of irregular astigmatism with contact lenses, Montague Ruben contact lens fitting post refractive surgery, Christine Astin orthokeratology, Leo Carney therapeutic soft contact lenses, Thomas John, et al. (Part contents.)

The binocular function as an indicator for the success of and need for unilateral contact lenses.

Ninety‐five patients were referred for fitting with unilateral contact lenses. One half of the patients had non‐traumatic aphakia, a quarter of them had traumatic aphakia, and the rest had anisometropia or reduced vision for other reasons. Wearing a trial lens, all patients were examined at the major amblyoscope, prior to prescription.In prescribing a unilateral contact lens, the aim is to re‐establish a useful binocular vision. Pre‐existence of certain qualities of binocularity is thus considered to be a prerequisite for success. In consequence of this, about 30% of the patients were rejected primarily, mainly because of strabismus. This rather high frequency exceeds the general incidence of squint and points to the fact that the fusional range, even in adults, may disorganize when one eye has been deprived of useful vision. To prove this hypothesis, a contact lens was tried in a number of patients even though their binocular state was doubtful. Follow‐up studies demonstrated that simultaneous perception near zero degree, a fusional range around 20 pd. and stereopsis were found to have an ever increasing rate through the groups of unsuccessful to successful cases. Thus, an orthoptic study must not be underestimated as an indicator for the success of. unilateral contact lens prescription.

The Visual World Of The New Contact Lens Wearer*

Summary A comparison is made between the various aspects of the visual surround of patients changing over from spectacles to contact lenses. Field of view, eye movements, aberrations, magnification, accommodation and convergence are considered. Numerical values are given in the form of graphs for the magnification effects and the accommodation and convergence requirements with equivalent spectacle and contact lens prescriptions. —Journal of the American Optometric Association.

Recent Developments in the Manufacture, Fitting and Prescription of Contact Lenses of Regular Shape

Recent Developments in the Manufacture, Fitting and Prescription of Contact Lenses of Regular Shape