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Titolo:
Naso-temporal asymmetry and contraction anisocoria in the pupillomotor system
Autore:
Schmid, R; Wilhelm, B; Wilhelm, H;
Indirizzi:
Univ Tubingen, Hosp Eye, Dept Pathophysiol Vis & Neuroophthalmol, D-72076 Tubingen, Germany Univ Tubingen Tubingen Germany D-72076 halmol, D-72076 Tubingen, Germany
Titolo Testata:
GRAEFES ARCHIVE FOR CLINICAL AND EXPERIMENTAL OPHTHALMOLOGY
fascicolo: 2, volume: 238, anno: 2000,
pagine: 123 - 128
SICI:
0721-832X(200002)238:2<123:NAACAI>2.0.ZU;2-T
Fonte:
ISI
Lingua:
ENG
Soggetto:
AFFERENT PUPILLARY DEFECT; OPTIC TRACT SYNDROME; LIGHT REFLEX; RHESUS-MONKEY; ANATOMICAL ANALYSIS; MACACA-MULATTA; PATHWAY; RETINA; FIELD; PROJECTIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Schmid, R Univ Tubingen, Hosp Eye, Dept Pathophysiol Vis & Neuroophthalmol, Schleichstr 12-16, D-72076 Tubingen, Germany Univ Tubingen Schleichstr 12-16 Tubingen Germany D-72076 ermany
Citazione:
R. Schmid et al., "Naso-temporal asymmetry and contraction anisocoria in the pupillomotor system", GR ARCH CL, 238(2), 2000, pp. 123-128

Abstract

Background: Differences between the pupillomotor sensitivity of nasal and temporal retinal hemifields may contribute to the relative afferent pupillary defect (RAPD) seen in optic tract or pretectal lesions. To understand the architecture of the pupillary pathway, it is necessary to know the size and the prevalence of such naso-temporal differences and also of contractionanisocoria (unequal direct and consensual pupillary responses) in normal individuals. The results of previous studies have been only partially consistent. Methods: We registered the direct and consensual pupillary light reactions in both central retinal hemifields of 32 healthy subjects by means ofIR video pupillography. Stimuli were generated under mesopic conditions ona computer screen as half-circles with 4.6 cd/m(2) and 10 deg radius. Stimulus duration was 200 ms with a stimulation interval of 4 s. a Results: Thenasal retina was significantly more sensitive than the temporal retina, and the direct pupillary reactions were significantly larger than the consensual reactions. For the nasal retina, direct pupillary reactions exceeded the consensual reactions, whereas there was nearly no difference between direct and consensual reactions for the temporal retina. Conclusion: RAPD in optic tract damage or pretectal lesions cannot be explained by the only slightly more sensitive nasal retina. Considerably more input would be needed from the contralateral than from the ipsilateral retina into the optic tract. The nearly equal direct and consensual pupil reactions when stimulating the temporal retina suggest an input of temporal retina to both sides of the pretectum. Such a crossing of temporal fibres may take place in the chiasm.

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Documento generato il 29/03/20 alle ore 09:28:52