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Samenvatting Het oog netuurwetenschappen/biologie

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delen: "beeldvoprming in het oog" "accomdatie in ooglens" "fotoreceptoren en prikkels" "beeldverwerking in hersenen"

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Institution
Secondary school
Study
2e graad
Course
School year
3

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Uploaded on
December 29, 2024
Number of pages
2
Written in
2024/2025
Type
Summary

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Natuurwetenschappen


samenvatting
Beeldvorming in het oog

lichtbreking gebeurt wanneer licht overgang maakt tussen twee doorzichtige
middenstoffen met andere dichtheid, waardoor licht van richting kan veranderen: lucht
→ hoornvlies → oogvocht → ooglens → glasachtig lichaam
bolle ooglens kan lichtbreking bijsturen, in oog door te vervormen. Centraal op netvlies
wordt een scherp, omgekeerd en verkleind beeld gevormd.




Accomdatie van de ooglens

Accommodatie → ooglens verandert vorm en lichtbreking voor scherp beeld op netvlies.
Bollere ooglens → versterkt lichtbreking.
Plattere ooglens → verzwakt lichtbreking.
Ooglens hangt aan straallichaam via lensbandjes.
Dichtbij scherpstellen → straallichaam samentrekken → ooglens boller.
Veraf scherpstellen → straallichaam ontspannen → ooglens platter.
Nabijheidspunt → kleinste afstand voor scherp zicht dichtbij; meest bolle ooglens.
Ouderdom → nabijheidspunt verder weg.
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