If your silkies cannot see, then you need to trim the feathers that block vision--this is usually NOT the crest itself (or at least not the part of it atop the head), but rather is the feathers that are in front of the eyes--next to the comb & beak. Muff feathers often will stick up and partially block vision.
If you hold your bird so that it's eyes are level with yours, you should be able to see them. If you can't see them, trim the feathers that are in the way. If you can see the eyes, the silkie can see. Baby nail scissors are good with their rounded end. You can also use hair tape to tie up the crest.
If you hold your bird so that it's eyes are level with yours, you should be able to see them. If you can't see them, trim the feathers that are in the way. If you can see the eyes, the silkie can see. Baby nail scissors are good with their rounded end. You can also use hair tape to tie up the crest.