ACTIVITY 2 CRITICAL WRITING: Answer the following questions thoroughly. Use clear and complete sentences. 1. What causes nearsightedness? How can this defect be corrected? 2. What causes farsightedness? How can this defect be corrected? 3. Compare and contrast the human eye and a camera in terms of their parts and functions 4. List additional five vision problems and discuss each by giving its description, causes and corrective measures.

1. Myopia can be corrected by wearing glasses/contacts with concave lenses these help to focus the image on the retina. Hyperopia: (farsightedness) This is a defect of vision in which there is difficulty with near vision but far objects can be seen easily. The image is focused behind the retina rather than upon it.

2. Farsightedness occurs when light is not refracted properly through an uneven, less smooth cornea or lens. It is a type of refractive error. Refractive errors can also cause myopia, or shortsightedness, and astigmatism. The light rays focus at a point behind the retina, and not onto it, because of the imperfect shape.

3. In a camera, film is used to record the image; in the eye, the image is focused on the retina, and a system of rods and cones is the front end of an image-processing system that converts the image to electrical impulses and sends the information along the optic nerve to the brain.

4. ?

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