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Samenvatting HC4 oogheelkunde - lens $3.25   Add to cart

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Samenvatting HC4 oogheelkunde - lens

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Last document update: 5 year ago

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  • May 28, 2019
  • June 17, 2019
  • 4
  • 2018/2019
  • Summary
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Lens

Niet behandelen:

- Misplaatste lens: ectopia lentis
- Vervormde lens: lenticonus, etc.

Op oudere leeftijd grotere en zwaardere lens:

- Ruimte inname – oogdruk (hogere oogdruk)
- De lens paradox (refractie lens verandert tussen 3 jr en 60 jr niet)
o Refractie-index wordt dus lager lens wordt dikker
- Presbyopie (kan minder makkelijk bewegen)

Functies lens:

- Accommodatie (m. ciliaris + zonulae + lenskapsel +
lensvezels)
o Aangespannen ciliaris: dichtbij (bol)
o Ontspannen ciliaris: verweg (plat)
- Transparantie – helder beeld vormen
o Regelmatige rangschikking lensvezels
o Hoge eiwitconcentratie
o Afwezigheid celorganellen (puur celmembraan met
eiwithoudend cytoplasma)
o Bescherming tegen oxidatieve schade
 Oxidatieve schade door: zuurstof radicalen
en waterstofperoxide (door bv. UV-licht)
 Nauwelijks reparatie
 Beschermingsmechanisme
 Lage zuurstofspanning (glycolyse;
anaerobe stofwisseling)
 Gluthationproductie door
lensepitheel; vangt zuurstof weg
 Ascorbinezuur (vit C) productie door ciliair epitheel

Cataract:

- Verlies transparantie
- visusdaling en/of glare
o indien geen visusdaling: glaremeting
uitvoeren
o indien geen visusdaling en/of glare  niet
opereren (geen of beginnen staar)
- Indeling naar oorzaak:
o Leeftijd
o Systeemziete
o Secundair (oogziekte, medicatie)
o Traumatisch
o Congenitaal

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