I’m not a physicist, but I’m thinking a human eye has about as much of a chance of becoming an optical black hole as any other piece of meat would.
But, the human eye already is an “optical black hole” of a sort; kind of. It is already capable of “trapping visible light”; once light enters your eyes it doesn’t get out again. :-)
Light enters they eye through the cornea, the cornea kind of bends the light through the pupil, then it goes through the lens, which refracts or kind of bends it toward the retina, where the “cones and rods” convert the light into electrical impulses and those impulses are transmitted through the optic nerve to your brain which perceives the image.
The light that enters the eye is “trapped” by it, kind of like a black hole.