perimeter

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Related to perimetry: gonioscopy

perimeter

1. Maths
a. the curve or line enclosing a plane area
b. the length of this curve or line
2. a medical instrument for measuring the limits of the field of vision

perimeter

[pə′rim·əd·ər]
(mathematics)
The total length of a closed curve; for example, the perimeter of a polygon is the total length of its sides.

perimeter

The boundary of a system or network, which defines the inside and outside. It is typically determined by firewalls and addresses. See DMZ.
References in periodicals archive ?
Retinal ganglion cell axon damage accounts for approximately 40% of early defects detected by standard automated perimetry, the gold standard for following glaucoma patients.
A small scotoma, determined by MP-1 perimetry and detected on face fields, is shown in Figure 2.
When adjusted for baseline difference in Humphrey perimetry 10-2 MD values, a dose-dependent improvement (p=0.
A comparison of MMT data with kinetic manual perimetry showed good correspondence of the detection aspect of the task (Trauzettel-Klosinski, Biermann, Hahn, & Weismann, 2003).
1) There also exists a wide variety of alternate methods for assessing visual function in AMD including contrast sensitivity, colour vision, shape discrimination and preferential hyperacuity perimetry.
Results are influenced by many factors for example, patient age, media opacities, visual acuity, perimetry technique and patient reliability.
2004) and that peripheral field devices that are used in many driver-screening centers (Keystone View Tester and Titmus Vision Tester) are poorly correlated with the results of standard Goldmann perimetry tests (Szlyk, Fishman, Master, & Alexander, 1991).
7) Harle and Evans cautioned against using short wavelength automated perimetry (SWAP) in migraine.
This debate has been sharpened by recent studies showing ocular hypertensive patients can lose as many as 50% of their optic nerve axon despite having normal kinetic visual fields, (4) or as many as their 35% of their ganglion cells despite normal automated threshold perimetry.