Structure of Cataract
Types of cataract:
It is also known as nuclear sclerotic cataract. It occurs in the center of the lens which is termed as nucleus. Over a period the lens gets hardens and turns yellow or brown. This might result in difficult vision and the halos are seen at night when bright objects are viewed.
This takes at the outside portion of the lens which is called as the cortex. They start as white wedges like triangles that point towards the center of the eye. As they develop they might result in the scatter of the light. The main symptom is glaring.this might result in haziness of the vision, fooging of the eye.
Posterior subcapsular cataracts:
These form just inside the back of your lens capsule, the part of your eye that surrounds the lens and holds it in place. They're directly in the path of light as it passes through the lens.
They're quicker to come on than other cataracts, and you may get symptoms within months. They affect your close-up vision and make it harder to see in bright light.
This forms in front of the lens capsule.
This is present since birth. Some are linked to the genes and others might occur due to illness such as the mother affected by rubella during pregnancy.
Any blunt trauma might result in swelling, thickening and whitening of the fibers of the lens. While the swelling and other conditions might resolve within time, but the whitening of the fibers preceded by configurational changes in protein.
Diabetes mellitus and intake of corticosteroids such as prednisone.
Lamellar pr zonular cataracts:
This cataract passess from parent to child. This might take fine white dots in the middle of the lens and might take the shape of the Y. the whole center portion might turn white.
Posterior polar cataracts
You get these on the back center of your lens, and they're often due to genes that are passed down through your family.
Anterior polar cataracts
They form on the front and center of your lens and look like small white dots. These cataracts typically cause any damage to the vision.
Christmas tree cataracts
They are called polychromatic cataracts. They shows shiny, colored crystals in your lens. They are most common in people who have a condition called myotonic dystrophy.
If nuclear cataract is left untreated it turns very hard and brown. This is called brunescent.
It makes it hard for you to tell colors apart, especially blues and purples. Surgery is difficult.