The only opening was a small net that provided an eyehole for the women to see through.
From the cnn.com
The portly, costumed ursine would regularly pop in for a refreshment, sipping beer via a straw piped through his eyehole.
From the sfgate.com
The proofs also ignore certain physical properties, such as the friction exerted by the lace on the eyehole.
From the newscientist.com
Sometimes they took on the form of kites, flatirons or figures-of-eight, or had rounded tops on a rectangular base with perhaps an eyehole inserted.
From the en.wikipedia.org
Images show retiarii stabbing downward at the secutor's unshielded legs or stabbing down at the helmet in an attempt to poke through an eyehole.
From the en.wikipedia.org
In a separate raid a woman was arrested after officers stormed into a flat in Sandwell Street, Caldmore, and discovered drug paraphernalia and a small camera taped to the eyehole of the front door.
From the expressandstar.com
More examples
Peephole: a hole (in a door or an oven etc) through which you can peep
Eyelet: a small hole (usually round and finished around the edges) in cloth or leather for the passage of a cord or hook or bar