Reichert Foresee PHP (Preferential Hyperacuity Perimeter), US $8,495.00 – Picture 0

Reichert Foresee PHP (Preferential Hyperacuity Perimeter), US $8,495.00 – Picture 1

Reichert Foresee PHP (Preferential Hyperacuity Perimeter), US $8,495.00 – Picture 2

Reichert Foresee PHP (Preferential Hyperacuity Perimeter), US $8,495.00 – Picture 3

Reichert Foresee PHP (Preferential Hyperacuity Perimeter), US $8,495.00 – Picture 4

Reichert Foresee Php (preferential Hyperacuity Perimeter)

US $8,495.00

Littleton, Colorado, United States
Jan 30th

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Pre-Owned Certified This unit has been tested to operate at factory specifications and has undergone a thorough exterior cleaning. This Accessories: Reichert Power Table, Keyboard, Printer(mounted under table) 14-Day Return Policy This instrument qualifies for our 14-Day return policy, just in case. Reichert PHP (Preferential Hyperacuity Perimeter) Foresee PHP® Technology Foresee PHP Technology is based on the well-studied phenomenon of hyperacuity. Hyperacuity, also known as Vernier acuity, is the ability to detect misalignment of an object’s location relative to other objects in space. This ability to detect misalignments is in the magnitude of 3-6 seconds of arc, which is 10 times better than the resolution ability in the fovea (around 30-60 seconds of arc). Hyperacuity is unaffected by a patient’s age and is highly resistant to retinal image degradation, and is thus suitable for assessing retinal function in patients with cataracts as well. How the Foresee PHP Test Works When a dot-deviation signal is projected on a healthy retina, it stimulates a collinear set of retinal receptive fields. Special neuronal circuits in the visual cortex process this information, leading to the perception of a straight dot-deviation signal. When retinal pigment epithelium (RPE) elevation occurs, both in the case of when drusen are present as in intermediate AMD, and often to a more significant degree when CNV develops, a geometric shift in photoreceptor location might occur. The photoreceptor fields stimulated during RPE elevation may be different than those stimulated on a normal retina. Therefore, linear signals may be perceived as distorted or misaligned. During the examination, the patient is presented with a series of dot deviation signals [Exam Figure 2]. These dot deviation signals are composed of a collinear set of points (dots), and include one or more dots positioned at different locations (artificial distortions). The patient is instructed to mark on the touch-screen any deviations they may see on the dotted line. Different magnitudes of artificial distortions are presented during the test, to compete with the patient’s actual pathological distortion(s) caused by AMD and a rise in the RPE. If there is a pathological distortion present, and it is more pronounced than the presented artificial distortion, the patient will preferentially pick their own pathological distortion Immediate Test Results The Foresee PHP records whether the patient noticed the artificial or pathological distortion, both distortions, or if the patient did not notice either distortion. During the test, the degree of the artificial distortions are varied to identify the magnitude and extent of the visual field defect. Patient response patterns are recorded and compared to a normative database. Immediate test results are presented in a detailed report. The first page test report presents a Hyperacuity Deviation Map that identifies visual field defects (see below) and provides confidence and reliability parameters (false positive and false negative errors) for the test results. The confidence level indicates the likelihood that the test results are consistent with CNV or with intermediate AMD. A second page history report (not shown) gives enhanced features, such as tracking of hyperacuity deviation maps, p-values, total area, and total integrated intensity.

Condition	Seller refurbished : An item that has been restored to working order by the eBay seller or a third party not approved by the manufacturer. This means the item has been inspected, cleaned, and repaired to full working order and is in excellent condition. This item may or may not be in original packaging. See the seller’s listing for full details.
Seller Notes	“This unit has undergone a complete cleaning and has been tested to operate at factory specifications. It has been used less than 20 times and looks and works like new.”