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For 6/6 = 1.0 acuity, the size of a letter on the Snellen chart or Landolt C chart is a visual angle of 5 arc minutes (1 arc min = 1/60 of a degree), which is a 43 point font at 20 feet. [10] By the design of a typical optotype (like a Snellen E or a Landolt C), the critical gap that needs to be resolved is 1/5 this value, i.e., 1 arc min.
Diabetic retinopathy (also known as diabetic eye disease) is a medical condition in which damage occurs to the retina due to diabetes.It is a leading cause of blindness in developed countries and one of the lead causes of sight loss in the world, even though there are many new therapies and improved treatments for helping people live with diabetes.
Optometrists are trained and licensed to practice medicine for eye-related conditions (including bacterial/viral infections, inflammation, glaucoma, macular degeneration, and diabetic retinopathy). They can prescribe all topical medications (eye drops) and most oral medications (taken by mouth), including scheduled controlled substances.
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).
It is routinely used to image Cystoid Macular Oedema and Diabetic Retinopathy among others. [ 14 ] Indocyanine Green Angiography (abbreviated ICG) is used primarily for imaging deeper choroidal diseases and utilises near-infrared diode laser of 805 nm and barrier filters allow light of 500 and 810 nm to be photographed.
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. One way to distinguish IRMA from retinal neovascularization is to perform fluorescein ...
Diabetic encephalopathy, Diabetes causes brain functional and structural disturbances, known as diabetic encephalopathy. [30] Various mechanisms are proposed, like alterations to the vascular supply of the brain, or changes in cerebral function and structure, including cognitive impairment, cerebral signal conduction, neurotransmission, and ...
Mild signs of hypertensive retinopathy can be seen quite frequently in normal people (3–14% of adult individuals aged ≥40 years), even without hypertension. [4] Hypertensive retinopathy is commonly considered a diagnostic feature of a hypertensive emergency although it is not invariably present.