Here is a photo of my chicken’s left eye before she become totally blind for reference. Her pupil was super dilated before it turned fully black.
The hock walking doesn’t seem like blindness as she seemed to know where she was and was pretty confident on where she was going.
Have you tried testing her for blindness? This seems a lot like what blindness would be. Move a hand or just a finger quickly towards her eye and see if she blinks. She may move away or flinch because she feels wind movement and expects a peck from a flockmate.