Sunt oare ochii capabili, în secret, de o viziune microscopică şi pot vedea acele bacterii mici ce plutesc în faţa retinei? Ochii pot şi au astfel de capacităţi, numai că bacterii plutitoare pe care uneori avem impresia că le vedem nu există.
Uneori, pe un fundal luminos cum ar fi un cer senin sau ecranul gol al computerului, este posibil să vezi lucruri plutitoare. Ce sunt aceste obiecte mişcătoare şi de ce le putem vedea?
Acest fenomen este numit muscae volitantes – latinul pentru termenul de muscă zburătoare- şi se întâmplă atunci când proteinele şi celulele roşii din sânge şi ţesuturi, aruncă umbre pe retină. În acest fimuleţ se explică cum apar aceste obiecte iluzorii în câmpul nostru vizual.
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