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Retinal hemorrhage (UK English: retinal haemorrhage) is a disorder of the eye in which bleeding occurs in the retina, the light sensitive tissue, located on the back wall of the eye. [ 1] There are photoreceptor cells in the retina called rods and cones, which transduce light energy into nerve signals that can be processed by the brain to form ...
Pseudoexfoliation syndrome, often abbreviated as PEX [1] and sometimes as PES or PXS, is an aging-related systemic disease manifesting itself primarily in the eyes which is characterized by the accumulation of microscopic granular amyloid-like protein fibers. [2] Its cause is unknown, although there is speculation that there may be a genetic basis.
Pronunciation. pɪˈtiːkɪə. Specialty. Rheumatology. A petechia ( / pɪˈtiːkiə /; [ 1] pl.: petechiae) is a small red or purple spot (≤4 mm in diameter) that can appear on the skin, conjunctiva, retina, and mucous membranes which is caused by haemorrhage of capillaries. [ 2][ 3] The word is derived from Italian petecchia ' freckle ', of ...
Vitreous hemorrhage is the extravasation, or leakage, of blood into the areas in and around the vitreous humor of the eye. [ 1] The vitreous humor is the clear gel that fills the space between the lens and the retina of the eye. A variety of conditions can result in blood leaking into the vitreous humor, which can cause impaired vision ...
Specialty. Cardiology. Cherry angioma, also called cherry hemangioma [ 1] or Campbell de Morgan Spot, [ 2] is a small bright red dome-shaped bump on the skin. [ 3] It ranges between 0.5 – 6 mm in diameter and usually several are present, typically on the chest and arms, and increasing in number with age. [ 3][ 4] If scratched, they may bleed.
Telangiectasias (from tel- 'end' angi- ' blood vessel ' and ectasia 'the expansion of a hollow or tubular organ'), also known as spider veins, are small dilated blood vessels [ 1] that can occur near the surface of the skin or mucous membranes, measuring between 0.5 and 1 millimeter in diameter. [ 2] These dilated blood vessels can develop ...
Specialty. Dermatology, hematology. Purpura ( / ˈpɜːrpjʊərə / [ 1]) is a condition of red or purple discolored spots on the skin that do not blanch on applying pressure. The spots are caused by bleeding underneath the skin secondary to platelet disorders, vascular disorders, coagulation disorders, or other causes. [ 2]
Orbital cellulitis is inflammation of eye tissues behind the orbital septum. It is most commonly caused by an acute spread of infection into the eye socket from either the adjacent sinuses or through the blood. It may also occur after trauma. When it affects the rear of the eye, it is known as retro-orbital cellulitis .