perimeter

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perimeter

 [pĕ-rim´ĕ-ter]
1. the boundary of a two-dimensional figure.
2. an apparatus for determining the extent of the peripheral visual field.

pe·rim·e·ter

(pĕ-rim'ĕ-tĕr),
1. A circumference, edge, or border.
2. An instrument, usually half a circle or sphere, used to measure the field of vision.
[G. perimetros, circumference, fr. peri, around, + metron, measure]

perimeter

[pərim′ətər]
Etymology: Gk, peri, around, metron, measure
1 the circumference, outer edge, or periphery of an object.
2 an instrument for measuring visual fields.
3 an instrument for measuring the circumference of teeth.

pe·rim·e·ter

(pĕ-rim'ĕ-tĕr)
1. A circumference, edge, or border.
2. An instrument, usually half a circle or sphere, used to measure the field of vision.
[G. perimetros, circumference, fr. peri, around, + metron, measure]

perimeter 

An instrument for measuring the angular extent and the characteristics (e.g. presence of scotoma) of the visual field. See campimeter; visual field; isopter; tangent screen.
arc perimeter Perimeter consisting of a semicircular arc, the inside surface of which is painted matt black or grey. The patient's head is placed such that the eye under investigation is located at the centre of curvature of the arc. The visual field is determined by moving a target along the black surface of the perimeter until the patient either just sees it or just no longer sees it. The targets are small discs of varying colour and size attached to the end of black wands or may be projected on the arc, which can be rotated around the fixation point located at its centre. Thus the visual field can be tested along any meridian.
automated perimeter An instrument to test the visual field in which the presentation of the stimuli and the recording are carried out electronically and under the control of a built-in computer. There exist many types (e.g. Henson CFA, Humphrey Field Analyzer, Octopus, Dicon). Computerized perimeters have the following advantages: the examination strategy is reproducible; they can be operated by non-specialists; the testing routine (e.g. number of stimuli or their location) can be altered by modifying the program; each instrument can contain several examination routines aimed at testing various pathologies (e.g. one for glaucoma and another for hemianopic defects); the computer capacity can be used for quantifying the results as, for example, in the Henson CFA where the visual fields can be classified as normal, suspect or defective on the basis of a system included in the instrument (Fig. P7). Syn. computerized perimetry. See Swedish Interactive Thresholding Algorithm; frequency doubling perimetry; short wavelength automated perimetry; Esterman test.
bowl perimeter See Goldmann perimeter.
Goldmann perimeter Perimeter consisting of a hemispherical bowl, the inside radius of which is 30 cm. Targets of varying intensity and size are projected onto the inside white surface. The background luminance of the bowl is also controlled. In addition there is a telescope attached to the back of the bowl through which the practitioner can verify that the patient maintains fixation. Goldmann perimeter can be used either for kinetic or static perimetry, although it is more appropriately designed for the former. Syn. bowl perimeter. See kinetic perimetry; static perimetry.
projection perimeter A perimeter in which the target is projected either onto an arc or a bowl such as the Goldmann perimeter.
Fig. P7 Computerized perimeter. (Humphrey Field Analyzer, Humphrey Instruments, Incenlarge picture
Fig. P7 Computerized perimeter. (Humphrey Field Analyzer, Humphrey Instruments, Inc
References in periodicals archive ?
a) Cubilete litico grabado y "matado" in situ, (b) Inhumacion doble junto al muro perimetral, (c) Fogon estmcturado al interior del templete, (d) Inhumacion en el recinto central con laminas de oro junto a otro bajo un cubilete grabado y "matado".
Las fotografias aereas tomadas previamente, a la modificacion del cauce del rio Mocoties para construir la avenida Perimetral, muestran un patron de drenaje con alta tendencia a ser anastomosado.
En marzo de 1984, las mujeres habian estado viviendo fuera de la valla perimetral durante un periodo de 907 dias.
Esta situacion considera que se desactiva el canal perimetral y que los escurrimientos superficiales de toda la cuenca ingresan a la laguna.
El plan maestro de Rio para su zona portuaria implica la demolicion de la autopista elevada Perimetral, que corre paralela a la costa, y la construccion de un tunel para reemplazarla.
Siguiendo esta metodologia, se recolecto una umbelifera que crecia debajo de un cerco perimetral (Myoporum laetum Forst.
El procedimiento se fundamenta en la combinacion del criterio de escalado dinamico, al mantener constante la relacion del impulso de los chorros de aire y gas, con la simulacion numerica de los fenomenos termicos y aerodinamicos en la camara de combustion, para obtener los parametros geometricos para el dimensionamiento del sistema de inyeccion de aire y gas, esto es, diametro de las boquillas de descarga del aire, diametro de la boquilla de descarga del gas, numero de boquillas de aire, distribucion perimetral de las boquillas de aire y posicion relativa de estas con respecto a la boquilla central de gas.
Los registros operativos utilizados en estos sistemas de produccion se encuentran el plano perimetral y detallado de la finca, nomina de personal, control sanitario, manejo de pastizales, registros de insumos (11,2%); otros adicionan una relacion de ingresos y egresos (18,5%), tambien hay gerentes que llevan todos los registros antes mencionados adicionando un programa de actividades y un libro de caja (45,3%) en tanto que un 25% no usan ningun registro.
Las zonas identificadas como criticas fueron: Sector Hipodromo de Ciudad Bolivar, Los Proceres parte alta, barrio 4 de febrero, sector Los Coquitos, sector Las Campinas-barrio San Simon, riberas del rio San Rafael, La Sabanita parte alta, La Sabanita cinturon de carcavas, barrio Brisas del Sur, avenida Perimetral cordon de invasiones adyacentes al vertedero sanitario, avenida Perimetral parte alta, barrio Jose Antonio Paez, barrio Virgen del Valle, sector Los Caribes, barrio Maipure, sector Marhuanta parte alta, Peru Viejo, urbanizacion El Peru parte alta cinturon de carcavas, barrio Los Aceiticos, urbanizacion Menca de Leoni, hi pod romo vi ejo, se cto r La Carioca, barrio La Shell, barrio La Lucha, sector Hueco Lindo.
En cuanto a la primera prioridad, tenemos 9 problemas fundamentales: vivienda, seguridad, salud equipamiento drenaje, alumbrado, asfaltado de calles, alumbrado, contaminacion y cercado perimetral (ver mapa No.
Las tomas de muestra de fango fueron realizadas por el personal del Ente Provincial de las Termas desde la vereda perimetral (borde de la laguna).
Tanto los restos humanos como las vasijas se encuentran en el fondo del cenote, en la seccion perimetral.