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Normally, a network of blood vessels known as the hyaloid vasculature is formed to help nourish the retina as it is constructed.

The hyaloid artery remains, as a prolongation of the retinal artery to the lens, until just before birth, but after that its sheath forms the canal of Stilling.

It is enveloped by a delicate capsule—the hyaloid membrane—which is connected in front with the suspensory ligament of the lens, and ends by joining the capsule behind the lens.

It is in contact with the surface of the retina at the back and with the attachments of the lens in front, being surrounded by a thin covering of its own, called the hyaloid membrane.

They are like two balls of fire, and there is a peculiar transparency of the hyaloid membrane, or injection of that of the retina.