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Melena is a form of blood in stool which refers to the dark black, tarry feces that are commonly associated with upper gastrointestinal bleeding. [1] The black color and characteristic strong odor are caused by hemoglobin in the blood being altered by digestive enzymes and intestinal bacteria .
Retina is the innermost layer of the eye. [2] It is made up of three layers, namely the outer pigmented layer, the middle photoreceptor layer and the inner neural layer. The pigmented layer absorbs light that penetrates the inner neural layer. The photoreceptor layer consists of 2 kinds of photoreceptor cells, rod cells and cone cells.
If the hyphema is large enough, it will also be visible on a penlight exam. Symptoms include bleeding in the front of the eye, sensitivity to light, pain in the eye, and blurry, clouded, or blocked vision. [14] Vitreous hemorrhage may be diagnosed when symptoms such as floaters, haziness, perception of shadows, or cobwebs are present. It is ...
The risk of retinal detachment is the greatest in the first 6 weeks following a vitreous detachment, but can occur over 3 months after the event.. The risk of retinal tears and detachment associated with vitreous detachment is higher in patients with myopic retinal degeneration, lattice degeneration, and a familial or personal history of previous retinal tears/detachment.
Corneal scarring occurs in up to half of cases and the blurred vision may continue for a long time in some people. [2] The virus may remain in the eye for 2–3 years after recovering. [3] It is a common cause of a red eye and tends to occur in large numbers of people at the same time. [2] Adults tend to be affected more frequently than ...
Here's what bacterial meningitis is, how it's different from viral and other types of meningitis, and what treatment can be expected.
The current average interest rate for a 30-year fixed mortgage is 6.91% for purchase and 6.91% for refinance — down 4 basis points from 6.95% for purchase and 4 basis points from 6.95% for ...
Epiretinal membrane or macular pucker is a disease of the eye in response to changes in the vitreous humor or more rarely, diabetes.Sometimes, as a result of immune system response to protect the retina, cells converge in the macular area as the vitreous ages and pulls away in posterior vitreous detachment (PVD).