Journal 2 (science)
Investigate the two types of sight defect- long-sightedness and short sightedness.
Find the following information:
Long sightedness
a. what causes the defect
Long sightedness has many different causes with the main one being generics. Other causes are diabetes, microphthalma.
b. the symptoms displayed
The main symptoms of long sightedness are persistent headaches, eyestrain, excessive blinking and dislike or avoidance of reading.
c. propose what sort of lens may be used to correct each vision.
The lens is a convex lens. A convex lens is chosen because it moves the image of a distant object forward onto the retina.
Short-sightedness
a. what causes the defect
It has a wide range of causes. The main ones are genetics and also sitting close to the tv.
b. the symptoms displayed
The main symptoms are squinting and eyestrain.
c. propose what sort of lens may be used to correct each vision
The type of lens that is needed a concave lenses because this will suit the needed requirements.
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