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Samenvatting Elektrofysiologie in oogheelkunde TOA, technisch oogheelkundig assistent $3.30   Add to cart

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Samenvatting Elektrofysiologie in oogheelkunde TOA, technisch oogheelkundig assistent

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DHTA, MBO Amersfoort. Elektrofysiologie in oogheelkunde

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  • April 14, 2021
  • 11
  • 2020/2021
  • Summary
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Elektrofysiologie in oogheelkunde
- Oogheelkundige diagnostische onderzoeken waarbij de elektrische potentialen van het
visuele systeem gemeten worden
- Welk deel van het oog?
o ERG
 Electro retinografie
 Diepe en oppervlakkige retinalagen
o EOG
 Electro oculografie
 Diepe retinalagen, pigmentepitheel
o VEP
 Visually evoked potentials
 Visuele cortex in occipitale kwab
- Elektrofysiologie van het visuele systeem
o Elektrische signalen  hersenen
o Lichtflitsen zorgen voor fotochemische reactie
o Elektrische lading van receptoren verandert
o Elektrische lading (potentialen) kunnen gemeten worden
o Electroden kunnen de signalen vastleggen
o Vergelijk met een ECG (electro cardiogram)
- Route netvlies
o Licht valt oog binnen  gaat door lagen heen  fotoreceptoren
o Staafjes en kegeltjes  zetten het om in  elektrische signalen mbv fotopigmenten
o Elektrisce signalen prikkelen de zenuwcellen  geven signaal door  ganglioncellen
(GCL)
o GCL  signaal bereikt  NFL, zenuwvezellaag  oogzenuw  stuurt verder




o
- Fotoreceptoren
o Kegeltjes
 Ongeveer 6 miljoen per oog
 Per kegeltje eigen zenuwcel
o Staafjes
 120 miljoen per oog
 1 zenuwcel met meerdere staafjes

, - Route
o Oogzenuw
o Hersenen  ziencentrum




o
- ERG
o Elektroretinografie
o Registratie van netvliessignalen
o Electrode op onderooglid
 Evt dmv ctl op cornea
o Electrode op ander punt
 Bv voorhoofd
o Onderzoek
 Duur 1 uur
 Vaak in mydriasis, tropi
 Bol met flitsen
 Eerst donkere kamer  daarna verlichte bol
 Bij pathologie onjuiste signalen naar oogzenuwbanen





o Meetcurve
 A. functioneren fotoreceptoren (FR)
 B. functioneren schakelcellen
 (bipolaire en Mullercellen in binnenste netvlieslagen)
 Netvlies functie uitval
 Lager ERG

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