Question

In: Nursing

1. List the parts of the eye that do not contain blood vessels and explain how...

1. List the parts of the eye that do not contain blood vessels and explain how they are nourished.

2. Describe the location and function of the photoreceptor cells.

3. Compare wide-angle and narrow-angle glaucoma, including the pathophysiology and signs of each.

4. Explain why infants and young children are predisposed to otitis media.

5. Differentiate conductive hearing loss from sensorineural loss and give an example of each

6. Explain why Ménière's syndrome causes both hearing loss and vertigo.

3. Compare the signs of chronic glaucoma, acute glaucoma, cataract, detached retina, and macular degeneration.

4. Describe the progress of a sound wave until it is identified in the brain.

5. Describe two ways in which otitis media can impair hearing permanently.

Solutions

Expert Solution

1. Cornea is domb shape clear protective outer layer of the eye. It does not contains blood vessels. It is nourished anteriorly by tears and posteriorly by acquous humor.

2. Photoreceptors in cells are located in retina. They are Rods and Cones.

Rods responsible for dark adapted vision. It consists of inner segment and outer segment. Inner segment contains nucleus and produced photopigment. It is called rhodopsin. Outer segment is transduction site.

Cones responsible for color vision.

3.

Wide angle glaucoma

  • It is also called open angle glaucoma.
  • Pathophysiology: chronic obstruction in the trabecular mesh work causes optic nerve damage leads loss of peripheral vision, tunnel vision.

narrow angle glaucoma

It is also called close angle glaucoma or acute glaucoma.

It occur as a result of dilation of iris causes lens stick to the back of iris which prevent fluid flow from posterior to anterior chambers. It causes fluid accumulation increase the intraocular pressure result narrow angle glaucoma. It seen in small eye with shallow anterior chamber.

4. Otitis media is middle ear infection. It is commonly found in infant and children because their eustachian tube is shorter and wider.

5.


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