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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 ...
Terson's syndrome is characterized by hemorrhages beneath the internal limiting membrane, which can be detected by optical coherence tomography (OCT). Despite being uncommon, fluorescein angiography may be useful in assessing retinal blood flow and detecting issues. To verify whether brain hemorrhages are present, neurological imaging is essential.
Vitreous hemorrhage may be diagnosed when symptoms such as floaters, haziness, perception of shadows, or cobwebs are present. It is usually painless. Visual acuity may be affected variably depending on the amount of blood in the visual axis. Diagnosis is made with slit lamp examination and confirmed with optical coherence tomography (OCT).
OCTA detects moving particles (red blood cells) by comparing sequential B-scans at the same cross-sectional location.To simply put it, the backscattered light reflected back from static samples would remain the same over multiple B-scans while the backscattered light reflected back from moving samples would fluctuate.
Intraretinal microvascular abnormalities (IRMA) are abnormalities of the blood vessels that supply the retina of the eye, a sign of diabetic retinopathy. [1] IRMA can be difficult to distinguish from and is likely a precursor to retinal neovascularization .
Findings include delayed venous filling, hypofluorescence caused by hemorrhage and capillary nonperfusion, dilation and tortuosity of veins, leakage due to neovascularization and macular edema. Optical coherence tomography is an adjunctive test in branch retinal vein occlusion. Macular edema is commonly seen on optical coherence tomography exams.
Another method of diagnosis or screening is through the use of spectral domain optical coherence tomography (SD-OCT) which follows the cotton wool spots and their progression. [1] The emergence of advanced technological tools like SD-OCT are providing new insight of neurosensory retinal health in vivo , especially in cases such as analysis of ...
Diagram of the human eye showing macula and fovea. Although J. D. Gass originally identified four types of idiopathic juxtafoveolar retinal telangiectasis in 1982, contemporary researchers describe three types collectively known as idiopathic juxtafoveal telangiectasia: macular telangiectasia type 1, macular telangiectasia type 2, and macular telangiectasia type 3.