 As she has wished since the age of 13, Karen Prendergast can fly now with none but her own hands on the aircraft controls with the voice of an instructor reading the instruments aloud. This is the only way Karen can fly. For 11 years ago, she was beset by a condition called retinopathy, which cost her her sight. Karen Prendergast, New England's newest flying lady, soars above breathtaking scenery and