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Budowa oka

Budowa oka

Krótki opis budowy oka

Średnica gałki ocznej wynosi około 2,5 centymetra. Mięśnie pozwalają mu poruszać się w każdym kierunku. Na światłoczułą siatkówkę, umiejscowioną na tylnej, wewnętrznej powierzchni pada odwrócony obraz oglądanego obiektu.


Odległość pomiędzy siatkówką a soczewką może się zmieniać (jest to tzw. akomodacja oka) - dzięki temu można oglądać świat z różnej odległości. Ochronę oku zapewnia twardówka, czyli zewnętrzna powłoka składająca się z włókien łącznotkankowych. W środkowym punkcie gałki ocznej znajduje się źrenica, która działa jak przysłona w aparacie fotograficznym zwiększając lub zmniejszając ilość wpadającego do oka światła.