isopter

isopter

 [i-sop´ter]
a curve representing areas of equal visual acuity in the field of vision.

i·sop·ter

(ī-sop'tĕr),
A line of equal retinal sensitivity in the visual field.
[iso- + G. optēr, observer]

i·sop·ter

(ī-sop'tĕr)
A line of equal retinal sensitivity in the visual field.
[iso- + G. optēr, observer]

isopter

In the determination of visual fields, it is the contour line representing the limits of equal retinal sensitivity to a given test target. See visual field; perimeter.
References in periodicals archive ?
Paracentral scotomas were identified by the smallest isopter. Case 2 could not discern I2E targets and had constricted I3E within 30[degrees].
The residual central island of vision was defined as an isopter constricted less than the central 30[degrees].
After 6 months, central isopter constriction was observed in 18 eyes (36.7%), diffuse defects in 21 eyes (42.9%), cecocentral defects in 3 eyes (6.1%), hemianopia or quadrantanopia in 5 eyes (10.2%), and central scotoma in 2 eyes (4.1%).
Visual field scores were obtained for each eye by summation of the degree of preserved visual field across the horizontal and vertical meridians using the III4e isopter. As quality of life of a patient is most affected by vision in the better-seeing eye, the eye with the larger initial visual field was analyzed for statistical purposes.
The extent of the centrally preserved visual field was obtained by computing the area surrounded by isopter polygons on scanned images of the perimeter charts and by calculating the solid angle subtended.
In autumn, a slight return of beetles and isopters in the menu of the hedgehog but the hymenoptera remain the most preponderant in the feeding of this animal.
Visual field improvement was defined as an improvement of the field defect by at least 10[degrees] horizontally and 15[degrees] vertically using similar isopters on the Goldman visual fields and significant changes in mean and pattern deviations in Humphrey visual fields.
Evaluation of efficacy and non- repellency of indoxacarb and Fipronil treated soil at various concentration and thickness against two subterranean termites (Isopters; Rhinotermitidae).
John's peripheral visual fields were plotted using Goldmann visual field equipment (see Figure 1 for the left eye and Figure 2 for the fight eye) with 14e and 12e isopters. John said that as far back as his early school days, he did not know where to start writing on a blank piece of paper.
Goldmann perimetry employs primarily a kinetic technique to plot boundaries of isopters (points joined together by a drawn line with equal levels of estimated sensitivity) and scotomas (depressed areas of sensitivity) by moving a visual stimulus from a non-seeing to a seeing region.
The visual field was assessed by means of Goldmann perimetry with the III4 and V4 isopters. The central area was examined by means of the Humphrey Field Analyzer (central 10[degrees], Swedish interactive test algorithm standard method; Bengtsson, Olsson, Heijl, & Rootzen, 1997) because this test allows a more detailed examination of the central area than does Goldmann perimetry.
Studies on the effects of age on the central and peripheral isopters of the visual field in normal subjects.