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The sclera's blood vessels are mainly on the surface. Along with the vessels of the conjunctiva (which is a thin layer covering the sclera), those in the episclera render the inflamed eye bright red. [6] In many vertebrates, the sclera is reinforced with plates of cartilage or bone, together forming a circular structure called the sclerotic ring.
A surgeon cuts an opening in the white portion of the eye known as the sclera, and removes a tiny area of the trabecular meshwork which enables the aqueous humor to discharge. [7] This lowers the internal pressure within the eye and lessens the chance of future damage to the optic nerve. [ 7 ]
Hives, or urticaria, is a form of skin rash with red, raised, itchy bumps. [1] They may also burn or sting. [2] Hives can appear anywhere on the surface of the skin. Whether the trigger is allergic or not, a complex release of inflammatory mediators, including histamine from cutaneous mast cells, results in fluid leakage from superficial blood ...
Hives are sometimes confused with a rash, which refers to any irritated, red, or itchy spots on the skin, according to the Cleveland Clinic. Hives are actually a type of rash, but not all rashes ...
Red eyes – due to dilated blood vessels on the sclera. [7] Swollen eyelids – due to inflammation. [7] Crusting at the eyelid margins/base of the eyelashes/medial canthus, generally worse on waking – due to excessive bacterial buildup along the lid margins. [4] [5] [7] Eyelid sticking – due to crusting along the eyelid margin. [7]
The eye can be considered as a living optical device. It is approximately spherical in shape, with its outer layers, such as the outermost, white part of the eye (the sclera) and one of its inner layers (the pigmented choroid) keeping the eye essentially light tight except on the eye's optic axis.
Red, itchy, or watery eyes are common symptoms of seasonal allergies, but they're also signs of pink eye, or conjunctivitis. Here’s how to tell the difference.
When a stress rash manifests as hives, it looks like raised, itchy bumps on the skin that may be red or pink. Hives can be a collection of individual bumps or connected, making one large bump.