Poison ivy is all green. The stem of poison ivy is brown and cylindrical, while blackberry and raspberry stems can be green, can be squared in cross-section, and can have prickles. Raspberries and blackberries are never truly vines; that is, they do not attach to trees to support their stems.
Occasionally, these blood vessels can burst and led to hemorrhage (bleeding) that appears as a red patch on the white of the eye. In the majority of cases, this type of bleeding (called subconjunctival hemorrhage) occurs without a known cause. Subconjunctival hemorrhage can also result from certain medical conditions including trauma, high blood pressure, eye infections, and bleeding disorders. The straining associated with vomiting, coughing, or sneezing can also sometimes lead to subconjunctival hemorrhage. Stress is not a recognized cause of subconjunctival hemorrhage. The good news is, if you had a conjunctival hemorrhage, these are only cosmetically annoying but go away and do not endanger the vision.
Also known as a subconjunctival hemorrhage, a broken blood vessel on the front of the eye is typically a harmless condition (although see below) that clears up within one to three weeks. Subconjunctival is the term used to describe the space located just beneath the conjunctiva (the clear surface of your eye). The term hemorrhage refers to the breakage of tiny blood vessels. Most people do not realize they have a broken blood vessel until someone tells them or they look in a mirror.