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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Graefe's archive for clinical and experimental ophthalmology 228 (1990), S. 363-368 
    ISSN: 1435-702X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Electronic dynamometry measurements, performed upon intraocular lens (IOL) haptics of prototype one-piece three-loop silicone lenses, accurately defined the relationships between elastic force and haptic displacement. Lens implantations in the capsular bag of dogs (loop span equal to capsular bag diameter, loops undeformed immediately after the operation) were evaluated macrophotographically 5–8 months postoperatively. The highly constant elastic property of silicon rubber permitted quantitative correlation of subsequent in vivo haptic displacement with the resultant force vectors responsible for tissue contraction. The lens optics were well centered in 17 (85%) and slightly offcenter in 3 (15%) of 20 implanted eyes. Of the 60 supporting loops, 28 could be visualized sufficiently well to permit reliable haptic measurement. Of these 28, 20 (71 %) were clearly displaced, ranging from 0.45 mm away from to 1.4 mm towards the lens' optic center. These extremes represented resultant vector forces of 0.20 and 1.23 mN respectively. Quantitative vector analysis permits better understanding of IOL-capsular interactions.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1433-0423
    Keywords: Schlüsselwörter Thrombendarteriektomie ; TEA ; Okulärer Blutfluss ; A. carotis ; Pulsamplitude ; Key words Thrombendarterectomy ; CEA ; Ocular blood flow ; Carotid artery ; Pulse amplitude
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract Successful operations of clinically significant carotid artery stenosis by carotid endarterectomy (CEA) are leading to a better perfusion in the region of this artery. It still creates problems to make a statement about cerebral and ocular perfusion during the operation. Methods. In 10 patients who underwent a CEA the pulse amplitude (PA) of the intraocular pressure (IOP) was measured intraoperatively by a pneumotonograph (OBF-Systems, U.K.) and the so called pulsatile ocular blood flow (pOBF) was determined. The middle arterial blood pressure (MAP) was taken invasively during the operation. Results. During the clamping phases no PA could be recorded. PA (p=0.04) and pOBF (p=0.028) increased on the side which had been operated on. No correalations of PA and pOBF to MAP were found. Conclusion. This method can prove an increased pulsatile ocular blood flow after successful CEA.
    Notes: Zusammenfassung Erfolgreiche Thrombendarteriektomien (TEA) der A. carotis interna führen zu einer verbesserten Perfusion im Stromgebiet dieser Arterie. Es ist jedoch schwierig, während der Operation Aussagen über die zerebrale und okuläre Durchblutung zu treffen. Methode. Bei 10 Patienten mit klinisch signifikanter A.-carotis-Stenose, die sich einer A.-carotis-TEA unterzogen erfolgte eine nichtinvasive intraoperative Messung der Pulsamplitude (PA) des intraokularen Drucks mit einem Pneumotonographen (OBF-Systems, U.K.). Aus der PA wurde der sog. Pulsatile okuläre Blutfluss (pOBF) errechnet. Der mittlere arterielle Blutdruck wurde während der gesamten Operation invasiv gemessen. Ergebnisse. Während der Abklemmphasen konnte keine PA gemessen werden. Postoperativ kam es zu einem Anstieg der PA (p=0,04) und des pOBF (p=0,028) auf der operierten Seite im Vergleich zu den präoperativen Werten. Es wurde kein Zusammenhang zwischen dem pOBF bzw. der PA und dem mittleren arteriellen Blutdruck festgestellt. Schlussfolgerung. Diese Methode kann eine veränderte pulsatile okuläre Perfusion nach einer erfolgreichen TEA nachweisen.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Der Ophthalmologe 97 (2000), S. 512-513 
    ISSN: 1433-0423
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Graefe's archive for clinical and experimental ophthalmology 238 (2000), S. 960-964 
    ISSN: 1435-702X
    Keywords: Keywords Age-related maculopathy ; Retina ; Macula ; Perfusion ; Blood flow
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Background: To investigate retinal capillary blood flow characteristics in patients with age-related maculopathy (ARM). Methods: Retinal capillary blood volume (VOL), blood flow (FLOW), and velocity (VEL) were measured in four macular sectors (I, II, III, IV) and in two areas beyond the temporal superior and inferior major vessel arcades (V and VI) in: 10 eyes with early ARM (drusen ≥63 µm and/or atrophy of the retinal pigment epithelium, RPE, 〈175 µm and/or proliferation of RPE), 13 with late ARM (exudative), 10 with late ARM (fibrotic), 14 normal eyes of 14 children of patients with ARM, and in 4 age- and sex-matched control groups using the Heidelberg retinal flowmeter (HRF). Statistical analysis was performed with the exact Wilcoxon test using an additional adjustment procedure by Bonferroni-Holm. Results: As compared to the control group, there was no significant change of VOL, FLOW, and VEL in patients with early ARM. In patients with late ARM (exudative), there was a significant higher FLOW in sectors I, II, and IV and a higher VOL and VEL in sectors III and IV. The group with late ARM (fibrotic) showed a reduction of VOL and FLOW in sectors I–IV and of VEL in sectors II and IV. In children of ARM patients, VOL, FLOW, and VEL of sectors I–VI did not differ from the control group. Conclusion: HRF measurements in patients with ARM indicate an increased macular retinal capillary blood flow in patients with the exudative form of late ARM and a decreased macular perfusion in those with the fibrotic form.
    Type of Medium: Electronic Resource
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