Three monkeys performed a visually guided reach-touch task with and without laterally displacing prisms. The prisms offset the normally aligned gaze/reach and subsequent touch. Naive monkeys showed adaptation, such that on repeated prism trials the gaze-reach angle widened and touches hit nearer the target. On the first subsequent no-prism trial the monkeys exhibited an aftereffect, such that t...

OBJECTIVES To validate the PRISM (Pictorial Representation of Illness and Self Measure) tool, a novel visual instrument, for the assessment of health-related quality of life in dermatological inpatients compared with the Dermatology Life Quality Index (DLQI) and the Skindex-29 questionnaires and to report qualitative information on PRISM. DESIGN In an open longitudinal study, PRISM and Skinde...

Vertical fusional vergence (VFV) normally compensates for slight vertical heterophorias. We employed magnetic resonance imaging to clarify extraocular muscle contributions to VFV induced by monocular two-prism diopter (1.15°) base-up prism in 14 normal adults. Fusion during prism viewing requires monocular infraduction. Scans were repeated without prism, and with prism shifted contralaterally. ...

PURPOSE To evaluate the effect of acrylic refractive prism and Fresnel membrane prism on stereoacuity in intermittent exotropia. MATERIALS AND METHODS Stereoacuities of fifty-two patients (mean age, 12.4 years; range 6 to 45 years) with intermittent exotropia were measured using the Titmus and TNO stereotests, while they wore prisms of varying power on nonfixating eye or evenly on each eye. ...

PURPOSE Although the treatment of symptomatic convergence insufficiency (CI) with base-in (BI) prism in adults has a strong theoretical foundation, there have been very few studies addressing its efficacy. The purpose of this study was to investigate whether the application of BI prism, using a novel progressive addition lens design which incorporates BI prism in the near portion only, could he...

A recent emergence of small, resource-constrained, and highlymobile computing platforms presents numerous new challenges for software developers. We refer to development in this new setting as programming-in-thesmall-and-many (Prism). This paper provides a description and evaluation of a middleware intended to support software architecture-based development in the Prism setting. The middleware,...

BACKGROUND Whether prism, especially base-up prism, affects the area of the retina used for fixation in a patient with central scotoma has been a controversial subject for 35 years. Our pilot study employed microperimetry to evaluate the effect of base-up prism on the fixation locus, or preferred retinal locus (PRL), in subjects with central scotoma. METHODS We used a microperimeter to assess...

In this paper, we present our work on extending the probabilistic model checking tool PRISM with Grid computing capabilities. PRISM is a tool for the verification and analysis of large, probabilistic models, a process which involves numerical solution techniques. Like most verification tools, PRISM can be very resource intensive and will benefit greatly from parallelisation efforts. Grid comput...

This paper describes a prototype virtualized file system, Prism, for supporting hosted servers and utility computing. Prism provides a filesystem service that allows lightweight creation of filesystems for new users from existing filesystems. All users’ filesystems are mutable and yet isolated from each other. In our experiments, new filesystems can be created from existing ones in under one-fi...

In this paper, we calculate optimal prism configurations for achromatic N-prism beam expanders of a single material; we argue that for moderate to high magnifications, that is, M > [2 1(2N-1 -1)]N, the upup ... up-down configuration is generally optimal, in the sense that it maximizes the transmission for given magnification. We also derive exact expressions for the incidence and apex angles th...