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 ?
Test-retest variability of multifocal visual evoked potential and SITA standard perimetry in glaucoma.
(17) Toxicity can be evaluated by subjective tests such as visual acuity score, corneal slit lamp examination, fundus examination and automated central perimetry 10-2 test.
Three children had a visual field defect as measured using Goldmann visual field perimetry (2 hemianopsia, 1 quadranopsia; see Table 2), and 3 children had a deficit of eye motility [37].
The visual field testing was performed using static automated white-on-white threshold perimetry (Humphrey Field Analyzer II; Carl Zeiss Meditec, Dublin, CA) with the 30-2 SITA (Swedish Interactive Threshold Algorithm) standard test.
- the perimetry does not show any significant changes, so that the program used does not address significantly the increase in muscle mass, or its time was too short;
Samuels, "Screening for glaucomatous visual field loss with frequency-doubling perimetry," Investigative Ophthalmology & Visual Science, vol.
In the latest TVST paper, "Refined Frequency Doubling Perimetry Analysis Reaffirms Central Nervous System Control of Chronic Glaucomatous Neurodegeneration", Sponsel and his research team found that the Jigsaw Effect begins at the earliest stages of glaucoma and discovered clues as to which part of the brain is responsible for optimizing vision in the face of glaucoma's slow destruction of sight.
In macroadenomas, the visual field improved in 80% patients (pre- and post-radiosurgery perimetry proven), while successful control of hormone was achieved in 85% functional adenomas.
[2] Nicotine is a poison to the optic nerve, and automated perimetry is one of the important qualitative and quantitative tests that helps in early detection of tobacco-induced ocular damage.
The use of FDT perimetry detected a general decrease in VF sensitivity, based on MD values, that was higher for both eyes but only significant for OS in the Cadre group.