My dog has hyphema ( blood in eyes ) what could cause this?

I took my dog to the vet friday morning after i found out wednesday he was pretty much blind all of a sudden. The vet was closed at night wednesday and thanksgiving so i had to wait almost 2 days. Anyways he seemed fine wednesday morning going to the bathroom etc. then i got up to be with him and noticed he wasnt using his eyes to get around but was leading with his nose/smell. Well his eyes were red and blood in them. His eyes were squinting/closing alot in the last few months but was told it was allergys, he has an auto immune disorder and also has dry skin, a bit of trobule walking (looks like sore bones), and the skin is thinning around his butt and he used to itch/scratch it but the vetagain said allergy's concerning the skin and he doesnt bother itching it anymore. Im basically wondering what could cause this hyphema and his now blindness, he had a bit of discharge/tearing from his eyes a while ago but again was told it was allergys. Please any options that cause this is help ty

My dog has hyphema ( blood in eyes ) what could cause this?
Glaucoma is an elevation of the pressure within the eye that is incompatible with normal function of the eye. It is a disorder of the outflow of fluid (aqueous humor) from the eye and not a disease of overproduction of fluid within the eye. Sudden, high elevations of pressure within the eye are common in the dog and can occur without warning over several hours. These acute elevations in pressure can cause devastating and irreparable damage to the retina (which acts like the film a the camera) and the optic nerve (which sends information from the eye to the brain).
Reply:A hyphema is the collection of blood in the anterior chamber of the eye. Visible as a reddish tinge in the anterior chamber, hyphemas are frequently caused by blunt trauma to the eye and may partially or completely block vision. When the anterior chamber is filled completely with blood, the eye appears black and is commonly known as an "eight ball hemorrhage".





A long-standing hyphema may result in hemosiderosis and heterochromia.[1]








[edit] Treatment


Bed rest and elevation (30-40 degrees); keep both eyes patched, sedate, and use medication to reduce anterior chamber pressure.





First Aid for Hyphema (blood in the anterior chamber of the eye) includes bed rest with head elevated by 45-60 degrees with both eyes closed (not patched or bandaged), application of ice-pack, avoidance of straining at stools and bending down. Medication to reduce eye-pressure and corticosteriods, both as eye-drops, should be started. No aspirin or NSAIDS. If pain is severe use Paracetamol.