Of course individual birds will vary in the amount of yellow suffusion they show and of course the depth of the yellow will vary. There are some excellent birds in existence and they could well be used as initial stock for producing yellow-faced albinos. When it comes to exhibiting yellow-faced albinos the classification must be very carefully examined to see just where such birds can be shown. It has been my experience that the eyesight of the red-eyed varieties varies considerably from specimen to specimen and from strain to strain. Generally speaking however their eyesight is not as good as that of the dark-eyed birds but nevertheless they can fly and find their perching very well indeed.
Strong sunlight is of course their worst enemy as it does have a bearing on their visibility.
However, with any variety of budgerigars there are birds which are much more vigorous than others in their same variety. Much depends on the ancestry of the various strains of colours whatever they may be.