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Disc Appearance (disc + appearance)

Distribution by Scientific Domains
Medical Sciences100%

Kinds of Disc Appearance

  • optic disc appearance
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    Selected Abstracts

    4354: Relationship between flicker FDF perimetry and standard automated perimetry

    ACTA OPHTHALMOLOGICA, Issue 2010
    P CALVO PEREZ
    Purpose To compare the main indices of flicker FDF perimetry (FDF, Heidelberg Engineering, Germany) with standard automated perimetry (SAP). Methods Twenty healthy subjects and twenty-three glaucoma patients were prospectively and consecutively selected. Glaucomatous patients had an intraocular pressure higher than 21 mmHg and glaucomatous optic disc appearance. All of them underwent at least one reliable perimetry with each device. SAPs were performed with a FDF perimeter (24-2 ASTA-Standard test) and Humphrey perimeter (Carl Zeiss (24-2 SITA standard algorithm). The Kolmogorov Smirnov test was applied to check that the data were normally distributed. Only one eye per subject was included in the study. Pearson correlations were calculated between both devices : mean deviation (MD), pattern standard deviation (PSD), and visual field index (VFI). Results Mean age was 58.41±12,4 years. MD of SAP was -2.82 ± 4.8 dB, and MD of FDF was -4.47 ± 4.8 dB (p=0.123); PSD of SAP was 3.11 ± 3.1, and PSD of FDF was 3.14 ± 1.4 (p = 0.953). The correlations between MDs were 0.521 (p<0.001) and between PSDs were 0.350 (p<0.001) Conclusion Moderate correlations were found between main visual field indices both devices. Altough no differences were found, FDF tends to present MD values lower than Humphrey. [source]

    Optic disc appearance and retinal temporal vessel arcade geometry in high myopia, as based on follow-up data over 38 years

    ACTA OPHTHALMOLOGICA, Issue 5 2010
    Hans C. Fledelius
    Abstract. Purpose:, To discuss (i) optic disc appearance and (ii) the retinal course of the temporal vessel arcade in a longitudinal series of high myopia patients followed between the ages of 16 and 54. Methods:, Thirty-nine individuals from a 1948 Copenhagen birth cohort (n = 9243) who had myopia of ,6 to ,15 D when aged 14 years were invited for current follow-up exams with 7,10-year intervals. Fundus photos were available from up to five occasions over 38 years, and single eye photo collages were studied with respect to posterior pole changes over time. Results:, Fifty-two eyes with high myopia were available. (i) Contrary to the expected predominance of large flat optic discs in long eyes, more than half the eyes in the sample had neurodiscs that were perceived to be small; many were also oval/kinked/tilted and with minimum or absent physiological cups. Among the fellow eyes with unilateral high myopia only one out of the 10 discs appeared as small/tilted. (ii) By age, a more acute angle between upper and lower temporal retinal vessel trunks was found in 12/20 eyes with adult myopia progression (change over time 5,23°) and in 6/24 eyes with stable myopia. In the myopia-progression subgroup, peaking of the angle was correlated with myopia degree, myopia increase and axial elongation. Conclusion:, Contrary to clinical expectation, we found neurodiscs that appeared to be small and dense in eyes with high myopia. We further discussed the eventual peaking of the angle between the temporal vessel arcades that is sometimes observed in high myopia. Occasionally, literature on myopia reports the presence of small and tilted discs whereas no mention was found of the issue of temporal vessel arcade peaking. [source]

    Optic nerve head parameters of an indigenous population living within Central Australia

    CLINICAL & EXPERIMENTAL OPHTHALMOLOGY, Issue 9 2006
    John A Landers MBBS MPH
    Abstract Purpose:, Clinical examination of the optic disc is an essential element in the assessment of its health. Previous work has described normal optic disc appearance among different races. No such description of optic discs exists for indigenous Australians, who are at low risk of developing glaucoma. This study was designed to evaluate optic disc parameters of indigenous Australians. Methods: A sample of 208 indigenous Australians were recruited as they presented to remote clinics in Central Australia. Each subject underwent optic disc photography using a Topcon TRC-NW100 digital fundus camera. Optic discs were measured and analysed with Topcon ImageNet 2000 software. Results: Among other parameters, mean vertical disc diameter and disc area were 2.13 ± 0.21 mm (mean ± SD) and 3.13 ± 0.57 mm2, respectively, for right eyes and 2.14 ± 0.21 mm and 3.16 ± 0.58 mm2 for left eyes. When compared with published studies, these parameters were significantly larger than Caucasians, but similar to African individuals. Conclusion:, Our results suggest that indigenous Australians have optic discs that are larger than those of Caucasians, but similar to those of Africans who are considered to at a greater risk of glaucoma. Factors other than optic disc area are likely to underlie the higher prevalence of primary open angle glaucoma among African individuals. [source]