Φακοι επαφης

Question

&Kappa;&alpha;&lambda;&eta;&sigma;&pi;&epsilon;&rho;&alpha; &gamma;&iota;&alpha;&tau;&rho;&epsilon;. &Eta;&theta;&epsilon;&lambda;&alpha; &nu;&alpha; &rho;&omega;&tau;&eta;&sigma;&omega; &alpha;&nu; &epsilon;&pi;&iota;&tau;&rho;&epsilon;&pi;&omicron;&nu;&tau;&alpha;&iota; &omicron;&iota; &phi;&alpha;&kappa;&omicron;&iota; &epsilon;&pi;&alpha;&phi;&eta;&sigmaf;  &sigma;&tau;&eta;&nu; &epsilon;&gamma;&kappa;&upsilon;&mu;&omicron;&sigma;&upsilon;&nu;&eta; (&omicron;&chi;&iota; &alpha;&pi;&omicron; &tau;&eta;&nu; &alpha;&pi;&omicron;&psi;&eta; &epsilon;&rho;&epsilon;&theta;&iota;&sigma;&mu;&omicron;&upsilon; &tau;&omicron;&upsilon; &mu;&alpha;&tau;&iota;&omicron;&upsilon;, &alpha;&lambda;&lambda;&alpha; &tau;&omega;&nu; &sigma;&upsilon;&sigma;&tau;&alpha;&tau;&iota;&kappa;&omega;&nu; &pi;&omicron;&upsilon; &pi;&epsilon;&rho;&iota;&epsilon;&chi;&epsilon;&iota; &tau;&omicron; &upsilon;&gamma;&rho;&omicron; &phi;&alpha;&kappa;&omega;&nu;).