 Drastic! Hey everybody, Dr. O'Hare, and this is where we're going to cover the chambers of the eye. So you see the ciliary body and the lens, they're going to separate the eye into a large posterior cavity, which is also called the vitreous chamber and a smaller anterior cavity. So let's start with the posterior cavity because it's actually easier. So the posterior cavity or this vitreous chamber is full of vitreous fluid or vitreous body, which is this gelatinous mass. If you ever dissect an eyeball, it's the part that kind of plops out and looks like snot. Its job is to help retain the shape of the eye, but also it supports the retina. So it actually keeps the retina from detaching. So sadly, my dad's going through this right now. His retina started to detach. They were able to reattach it. Things are pretty good. But they had to insert some gas and he had to stay on his stomach for a week. So this gas bubble would hold the retina in place while it healed. So the vitreous body is supposed to do that. So that's going to be the posterior cavity of the eye full of this vitreous body or vitreous humor. So the anterior cavity then has to be further subdivided. So we have the anterior cavity, and this gets confusing, but the anterior cavity is broken down to the anterior chamber and the posterior chamber. So the anterior chamber is going to extend from the cornea, the transparent portion of the outside of the eye, to the iris. So that's going to be the anterior chamber of the anterior cavity. Then between the iris and the ciliary body and lens, that's going to be the posterior chamber of the anterior cavity. So what's important up here? So this is going to be full of the fluid aqueous humor, which looks a lot more like water. So aqueous humor is going to circulate in this anterior cavity. And then after it's done circulating, it's going to be removed by draining into the canal of schlem, also called the scleral venous sinus. So the amount of fluid in this anterior cavity is what determines your intraocular pressure. It's why they shoot that puff of air in your eye at the eye doctor. They're looking to make sure you don't have too much pressure there in the anterior cavity of the eye. Too much pressure can lead to glaucoma and nerve damage. So speaking of my father's procedure, a couple of days after they were concerned, because his eye pressure was too high, and they had to use several drugs to bring it back down, or else he was going to be permanently blind. So too much eye pressure can lead to, like I said, optic nerve damage and glaucoma. OK, so those are the cavities of the eye, and then the anterior cavity being further broken down into an anterior and posterior chamber. I hope this helps. Have a wonderful day. You blessed.