What is the pathophysiology of diabetic retinopathy?

DME is characterized by swelling or thickening of the macula due to sub- and intra-retinal accumulation of fluid in the macula triggered by the breakdown of the blood-retinal barrier (BRB) [1]. DME can occur at any stage of DR and cause distortion of visual images and a decrease in visual acuity.

How does diabetes cause retinal ischemia?

When blood sugar levels are too high for extended periods of time, it can damage capillaries (tiny blood vessels) that supply blood to the retina. Over time, these blood vessels begin to leak fluids and fats, causing edema (swelling). Eventually, these vessels can close off, called ischemia.

What is the most common cause of visual loss in patients with nonproliferative diabetic retinopathy?

Macular edema is the most common cause of vision loss in patients with nonproliferative diabetic retinopathy (NPDR). However, it is not exclusively seen in patients with NPDR; it may also complicate cases of proliferative diabetic retinopathy.

Who is at risk for diabetic retinopathy?

Retinopathy is a high risk for diabetics Anyone with diabetes is at risk of developing retinopathy. People with diabetes (type 1 and type 2) are 25 times more likely to experience vision loss than people without diabetes.

How does hyperglycemia cause retinopathy?

Diabetic retinopathy is caused by prolonged high blood glucose levels Over time, high sugar glucose levels can weaken and damage the small blood vessels within the retina. This may cause haemorrhages, exudates and even swelling of the retina. This then starves the retina of oxygen, and abnormal vessels may grow.

What is diabetic macular ischemia?

Diabetic macular ischemia (DMI) is an important clinical feature of diabetic retinopathy (DR). It has been postulated that the selective loss of pericytes and thickening of the basement membrane in retinal capillaries occurs as a result of exposure to elevated blood glucose over an extended period of time.

What does flashing in eyes mean?

Causes of floaters and flashes They’re usually caused by a harmless process called posterior vitreous detachment (PVD), where the gel inside your eyes changes. Sometimes they can be caused by retinal detachment. This is serious and can lead to permanent vision loss if not treated.

What is the pathogenesis of diabetic retinopathy?

Diabetic retinopathy involves anatomic changes in retinal vessels and neuroglia. The pathogenetic mechanism responsible for retinopathy is imperfectly understood, but much of the mechanism is apparently reproduced by experimental diabetes in animals and by chronic elevation of blood galactose in nondiabetic animals.

Are there any new treatments for diabetic retinopathy?

The advent of anti-vascular endothelial growth factor (VEGF) therapy demonstrated remarkable clinical benefits in DR patients; however, the majority of patients failed to achieve clinically-significant visual improvement. Therefore, there is an urgent need for the development of new treatments.

Who are the authors of diabetic retinopathy research?

Diabetic Retinopathy: Pathophysiology and Treatments Int J Mol Sci. 2018 Jun 20;19(6):1816.doi: 10.3390/ijms19061816. Authors Wei Wang 1 , Amy C Y Lo 2 Affiliations

Where are dot and blot hemorrhages in diabetic retinopathy?

Dot and blot hemorrhages occur as microaneurysms rupture in the deeper layers of the retina, such as the inner nuclear and outer plexiform layers. These appear similar to microaneurysms if they are small; fluorescein angiography may be needed to distinguish between the two.