What happens if the scleral venous sinus is blocked?
Blockage of the aqueous humour flow causes increased pressure in the posterior chamber, and this pressure is transmitted by way of the vitreous to the optic nerve head and the retina. Abnormally high intraocular pressure that is unrelieved causes vision impairment.
What is the scleral venous sinus?
The scleral venous sinus (canal of Schlemm) is a circular channel in theeye that collects aqueous humor from the anterior chamber and delivers it into the bloodstream via the anterior ciliary veins.
Where does canal of Schlemm drain to?
The Schlemm’s canal is drained by 25-30 collector channels. These convey the aqueous humor to the deep scleral plexus, which then empties into the intrascleral plexus. The latter drains into the episcleral plexus, which finally opens into the anterior ciliary veins.
Where is the canal of Schlemm is blocked?
The canal of Schlemm is a channel in the eye that collects aqueous humor from the eye and moves it into the bloodstream. If the canal is blocked, the pressure in the eye can increase, resulting in glaucoma. Glaucoma is a condition that causes damage to the eye’s optic nerve.
What can cause glaucoma?
Risk factors
- Having high internal eye pressure (intraocular pressure)
- Being over age 60.
- Being black, Asian or Hispanic.
- Having a family history of glaucoma.
- Having certain medical conditions, such as diabetes, heart disease, high blood pressure and sickle cell anemia.
- Having corneas that are thin in the center.
Why do you have a blind spot in each eye?
Why You Have a Blind Spot When light lands on your retina, it sends electrical bursts through your optic nerve to your brain. Your brain turns the signals into a picture. The spot where your optic nerve connects to your retina has no light-sensitive cells, so you can’t see anything there. That’s your blind spot.