11. |
- Frisén, Lars, 1939, et al.
(author)
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Cyclic compression of the intracranial optic nerve: patterns of visual failure and recovery.
- 1976
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In: Journal of neurology, neurosurgery, and psychiatry. - 0022-3050. ; 39:11, s. 1109-13
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Journal article (peer-reviewed)abstract
- A patient with a cystic craniopharyngioma below the right optic nerve had several recurrences requiring surgery. Finally the cyst was connected with a subcutaneous reservoir by means of a fine catheter. Symptoms of optic nerve compression recurred more than 50 times during the following year, and were relieved within seconds upon drainage of the reservoir. In each cycle, a drop in visual acuity preceded a measurable change in the visual field. The pattern of field changes was an increasingly severe, uniform depression. Optic nerve ischaemia induced by compression was probably the most important factor causing visual failure in this case.
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12. |
- Frisén, Lars, 1939, et al.
(author)
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Detection of extracranial carotid stenosis by computed tomography.
- 1979
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In: Lancet (London, England). - 0140-6736. ; 1:8130, s. 1319-20
-
Journal article (peer-reviewed)abstract
- Ten patients with transient ischaemic attacks (T.I.A.) within the carotid territory were examined by aortic-arch angiography and computed tomography (C.T.) of the neck. C.T. showed evidence of carotid calcifications in all 17 angiographically abnormal arteries, and there was no evidence of calcification in the 3 normal arteries. C.T. of the neck promises to be a useful technique for the investigation of patients with T.I.A.s.
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13. |
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14. |
- Frisén, Lars, 1939, et al.
(author)
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Drusen in the optic nerve head. Verification by computerized tomography.
- 1978
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In: Archives of ophthalmology (Chicago, Ill. : 1960). - 0003-9950. ; 96:9, s. 1611-4
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Journal article (peer-reviewed)abstract
- Five patients with a clinical diagnosis of buried or exposed drusen of the optic nerve head were examined by computerized tomography (CT). The relative x-ray absorption within their nerve heads was significantly larger than in controls, reflecting the high calcium content of drusen. Computerized tomography, and particularly high-definition CT, therefore merits consideration in the investigation of disc swelling.
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15. |
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16. |
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17. |
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18. |
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19. |
- Frisén, Lars, 1939, et al.
(author)
-
Objective recognition of abnormal isopters.
- 1975
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In: Acta ophthalmologica. - 0001-639X. ; 53:3, s. 378-92
-
Journal article (peer-reviewed)abstract
- We have examined the hypothesis that normal and only normal isopters of the central visual field are elliptical, except for random deviations. Statistical methods capable of recognizing small deviations from elliptical shape have been developed. Theses methods have been devised to meet the special demands of clinical testing of visual fields and require only simple calculations. The qualities of these methods were examined by theoretical analysis, by large-scale simulations, and by experimental comparison with subjective evaluations. The new methods proved very useful in these examinations. A clinical study using a servo-equipped Goldman perimeter demonstrated that normal central isopters are elliptical enough for the proposed test characteristic to be of practical value in clinical work. The method allows an objective recognition of abnormal isopters with a high degree of sensitivity.
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20. |
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