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Pinhole inlay

Perry S Binder
The current nonsurgical approaches for the correction of presbyopia are spectacles or contact lenses or the use of pharmaceuticals to create an artificial pupil and/or to stimulate residual accommodation. Refractive surgical procedures use a monovision approach and/or a multifocal corneal laser ablation with or without the induction of negative spherical aberration to improve near vision. More recently, new surgical approaches include intracorneal inlays. Inlay approaches include increasing corneal curvature alone, implanting a multifocal inlay, or by implanting a small aperture device that functions as a pinhole to restore unaided near and intermediate visual acuity...
September 2017: Eye & Contact Lens
Shehzad Anjam Naroo, Paramdeep Singh Bilkhu
The treatment of presbyopia has been the focus of much scientific and clinical research over recent years, not least due to an increasingly aging population but also the desire for spectacle independence. Many lens and nonlens-based approaches have been investigated, and with advances in biomaterials and improved surgical methods, removable corneal inlays have been developed. One such development is the KAMRA™ inlay where a small entrance pupil is exploited to create a pinhole-type effect that increases the depth of focus and enables improvement in near visual acuity...
2016: Clinical Ophthalmology
Timo Eppig, Corinna Spira, Berthold Seitz, Nóra Szentmáry, Achim Langenbucher
BACKGROUND AND PURPOSE: Presbyopia is characterized by a decreasing ability of accommodation - the eye's ability to alter the focus between far and near distance objects. After cataract surgery, accommodation is completely lost. Several years ago, small aperture (pinhole) implants have been presented in order to increase the depth of focus providing functional vision at far and near distance without the need for spectacles. We simulated the theoretical depth of focus with three different pseudophakic eye models in order to investigate the potential benefit arising from the implantation of small aperture optical (SAO) implants...
June 2016: Zeitschrift Für Medizinische Physik
Juan Tabernero, Pablo Artal
PURPOSE: To determine the optimum position to center a small-aperture corneal inlay and the effect of residual defocus in the surgical eye to maximize depth of focus. SETTING: Laboratorio de Óptica, Universidad de Murcia, Murcia, Spain. DESIGN: Cohort study. METHODS: Personalized eye models were built using actual data (corneal topography, eye length, ocular aberrations, and eye alignment). A small aperture 1.6 mm in diameter was placed at the corneal plane in each model...
February 2012: Journal of Cataract and Refractive Surgery
K X Gkobedaros, P D Garephe
No abstract text is available yet for this article.
March 1973: Odontiatrike
F Höflin, H Ledermann, U Noelpp, R Weinreich, H Rösler
There is a recent need to study glucose metabolism of the heart in ischemic, as well as in "hibernating or stunned" myocardium, and compare it with that in perfusion studies. In non-positron emission tomography centers, positron imaging is possible with a standard Anger-type camera if proper collimation and adequate shielding of the camera crystal can be achieved. For the study with fast-decaying isotopes, seven-pinhole tomography (7PHT), a limited-angle method designed for transaxial tomography of the left ventricle using a nonrotating camera, is well suited, because projections are acquired simultaneously...
December 1989: Angiology
O W Rogers
The information obtained from the metallographic procedure used in this paper, as compared with techniques of the past, indicates that certain subgroups such as pinhole porosity, microporosity and subsurface porosity require re-evaluation.
April 1977: Australian Dental Journal
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