...tii muschilor oculari de a schimba forma lentilelor , pentru a focaliza corect imaginea pe retina .Miopia poate fi corectata prin folosirea lentilelor biconcave. Presbitismul,este cauzat de pierderea elasticitatii ochiului odata cu inaintarea in varsta, apare deobicei dupa varsta de 50 de ani , si poate fi corectata prin purtarea unor ochelari cu lentile convexe. Strabismul poate fi corectat pin purtarea unor lentile speciale, dar in stadii avansate, este necesara o operatie asupra muschilor oculari. Ambliopia este o slabire a vederii, fara o avarie fizica a ochiului, si poate fi cauzata de abuzul de droguri, alcool , tigari ,sau poate fi cauzate de isterie.DaltonismulEste cauzat de un defect congenital in retina , sau pe o portiune a nervului optic.OrbireaPresiunea pe nervul optic poate cauza orbirea.Desprinderea retinei din interiorul globului ocular poate cauza orbire, pentru ca retina va iesi din cadrul imaginii formate de lentile.Corectarea permanenta a acestui defect se face numai prin operatieBibliografieMicrosoft Encarta 99 EncyclopediavalUbi6hnH5CJOJaQJaCJOJaQJaajU5CJ,vaak
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