Causes for diabetic retinopathy:
Retina is a tissue layer lying behind the eye which is
responsible for changing of image, but due to high levels of blood sugar over a
long period leads to blockage of the blood vessels which supply blood to the
retina. So, the eye attempts to produce new blood vessels, which are usually
weak and can leak easily and create scar tissue that can cause a loss of
vision. High blood pressure also leads to diabetic retinopathy.
People with diabetes for longer period are certainly
to show the chances of developing diabetic retinopathy. By maintaining the
diabetes under control will help slower the process of retinopathy.
Women with diabetes should have an eye exam before
planning to get pregnant.
Diabetic retinopathy leads to haemorrhages, exudates
and even swelling of the retina.
Diagnosis of diabetic retinopathy:
Diabetic retinopathy is detected by comprehensive
dilated eye exam which includes
Visual
acuity testing – Here eye chart is used to measure the
persons ability to see at various distance and how much the eye is being
damaged.
Tonometry
– It
is performed to measure the pressure inside the eye.
Pupil
dilation – Here eye drops are used to dilate the
pupil which helps the physician to easily examine the retina and the nerves
Optical
coherence tomography (OCT) – A similar technique used
in ultrasound but here instead of sound waves light waves are used to capture
pictures of tissues. By OCT a detailed image of the tissue.
Fluorescein
angiogram – Here Fluorescein angiogram is used to detect the
damaged or leaky blood vessels. In this test, fluorescent dye is injected into
the bloodstream usually to the arm vein, as the dye reaches the eye pictures of
the retinal blood vessels are taken and examined.
By performing a comprehensive dilated eye exam, the
physician can examine:
-
Changes in the blood vessels
-
Leakage of blood vessels or signs of leaky
blood vessels
-
Swelling of the macula
-
Changes in the lens if required or not
-
Any damage to the nerve tissue
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