Roger is legally blind. His vision impairment is a complication of diabetes mell

Question

Roger is legally blind. His vision impairment is a complication of diabetes mellitus. Can you describe what structural changes in Roger’s eyes have caused his blindness? As you were helping him cross the street, a fellow pedestrian suddenly stumbled into your path. Without any signal from you, Roger jumped back to avoid hitting the other person. If Roger is blind, how could he have reacted this way?

In this case study Roger has a disease in which a side effect is blindness. Research “diseases that causes blindness”; and choose a disease to write about. Describe the disease, how it is contracted and how it causes blindness. For example, Roger has diabetes and you have already researched the structural change in the eye that caused blindness; do the same for the disease you chose to write about.

Explanation / Answer

High blood sugar levels from diabetes lead to damage of the retina, the layer on the back of the eye that captures images and sends them as nerve signals to the brain and cause blindness

In the small, round area where the optic nerve meets the retina, there are no rods or cones. If light from an object lands on this spot, the image is essentially invisible. This area is called the optic disk, or the blind spot. In effect, it's a black hole in the retina's projection screen.

The brain fills this blind spot with the patterns of the objects surrounding environment. It uses information received fractions of a second prior from a different distance or angle. thats why roger jumped back .

Glaucoma is a disease that can cause damage to the optic nerve, increased pressure, called intraocular pressure, can damage the optic nerve, which transmits images to the brain. If damage to the optic nerve from high eye pressure continues, glaucoma will cause permanent loss of vision. Without treatment, glaucoma can cause total permanent blindness.

This can happen when eye fluid isn't circulating normally in the front part of the eye.

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