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Resolution Perimetry (resolution + perimetry)

Distribution by Scientific Domains
Medical Sciences100%

Kinds of Resolution Perimetry

  • high-pass resolution perimetry
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    Selected Abstracts

    Multiple sclerosis siblings with cerebrospinal fluid immunopathy but without any indication of neuronal damage

    ACTA NEUROLOGICA SCANDINAVICA, Issue 5 2003
    S. Haghighi
    Objective , In a previous study, we found that nine of the 47 siblings to multiple sclerosis (MS) patients with a normal neurologic examination carry an intrathecal oligoclonal immunopathy with limited specificity, a condition we termed MS immunopathic trait. Here we searched for neurological dysfunction with increased sensitivity. Method , We used high-pass resolution perimetry, which reveals visual pathway lesions by their impaired neural effective capacity (EC) in early MS cases even without optic neuritis. Results , These nine individuals with MS immunopathic trait did not differ from nine healthy controls with normal cerebrospinal fluid regarding their EC. Conclusion , This is further evidence that a group of MS immunopathic trait individuals, siblings to MS patients, are essentially free from the central nervous system functional loss typically found in MS. [source]

    The role of optical coherence tomography in the detection of pituitary adenoma

    ACTA OPHTHALMOLOGICA, Issue 7 2009
    Charlotta Johansson
    Abstract. Purpose:, To analyse retinal nerve fibre layer (RNFL) thickness in eyes with compression of the optic chiasm by a pituitary adenoma. RNFL thickness was analysed with optical coherence tomography (OCT) and compared to visual field measurements using high-pass resolution perimetry (HRP). Methods:, Sixteen eyes from eight patients with pituitary adenoma were studied. All had bitemporal visual field depression caused by compression of the optic chiasm. Patients were submitted to an ophthalmic examination more than 14 months after surgery (seven patients had undergone trans-sphenoidal and one trans-cranial adenomectomy). The examination included HRP, fundus photography and measurement of the peripapillar RNFL thickness using OCT. Results:, In spite of temporal visual field depression, not all eyes showed reduced RNFL thickness by OCT. This was also true for some eyes in which RNFL was judged to be reduced on fundus photographs. Contrary to our expectations, RNFL thickness in the nasal quadrant was normal in nine of the 16 eyes. Corresponding figures for the superior, inferior and temporal quadrants were eight, six and five, respectively. The overall RNFL thickness, as measured by OCT, did not correlate well with neural capacity, which is an index of remaining retino-cortical neural channels in HRP. Conclusion:, RNFL thickness as measured with OCT was reduced in most, but not all, eyes with temporal field depression caused by chiasmal compression. The pattern of RNFL loss did not correlate well with the visual field defect. Sensitivity of RNFL thickness measurement in OCT was low. The method has limited value in the diagnosis of pituitary tumour compression. [source]

    Frequency doubling technology and high-pass resolution perimetry in glaucoma and ocular hypertension

    ACTA OPHTHALMOLOGICA, Issue 3 2003
    Lada Kalaboukhova
    Abstract. Purpose:, To study the correlation between frequency doubling technology perimetry (FDT) and high-pass resolution perimetry (HRP) in eyes with primary open-angle glaucoma, suspect glaucoma, ocular hypertension, and in normal eyes. Patients and Methods:, Ninety-four patients (162 eyes) were studied. Visual fields were assessed by HRP, FDT screening C-20,5 and FDT threshold C-20 programs. In eyes with a discrepancy between the test results, a comprehensive clinical examination was performed, including optic disc photography and Heidelberg retinal tomography (HRT). Results:, There was a strong correlation between HRP global deviation and the FDT mean deviation (for FDT threshold C-20 test), and between HRP score and FDT score (for FDT screening C-20,5 ). The correlation coefficients were r = ,0.83 and r = 0.77, respectively. In all, 75 eyes (46.3%) had normal HRP and FDT screening results, while 67 eyes (41.4%) showed abnormal results in both tests. In 12 eyes (7.4%) HRP was within normal limits while FDT screening was abnormal. Seven of these eyes were judged to have glaucoma; three of them had converted from ocular hypertension to glaucoma. In eight eyes (4.9%) HRP was abnormal while FDT screening was normal. Three of these were judged to have glaucoma. Thus, the sensitivity and specificity of the FDT screening test for the detection of glaucoma were 91.7% and 87.8%, respectively. Conclusion:, There was a strong correlation between FDT threshold C-20, FDT screening C-20,5 and HRP test results. Frequency doubling technology perimetry C-20,5 represents a good screening test for the detection of optic nerve damage in open-angle glaucoma. [source]

    Dynamics of visual improvement following chiasmal decompression.

    ACTA OPHTHALMOLOGICA, Issue 5 2002
    Quantitative pre-, postoperative observations
    ABSTRACT. Purpose:, To study early visual restoration following surgical removal of pituitary adenomas compressing the optic chiasm. Methods:, Eleven patients were examined with high-pass resolution perimetry (HRP) before and after trans-sphenoidal adenomectomy. Visual fields were examined on the second postoperative day. The result was interpreted in terms of the estimated fraction of functioning retino-cortical connections. Results:, In the upper and lower temporal visual field quadrants, the mean increases in the fraction of functioning neural channels were 19% (p <,0.001) and 17% (p =,0.001), respectively, on day 2 after surgery. These increased to 35% on day 12. The nasal hemifield showed no change on day 2, but functioning neural channels had increased by 15% on day 5 (p =,0.017). Mean visual acuity improved from 0.6 preoperatively to 1.0 on day 2 (p =,0.030) but did not change significantly thereafter. Conclusion:, All visual field sectors and visual acuity improved after surgery. Improvement starting in the temporal hemifield was already evident on the second postoperative day. [source]