Journal entry 2
a. what causes the defect?
Long-sightedness: The exact cause of long sightedness is unknown and not well understood.
Short-sightedness: Short-Sightedness usually develops in children or young teenagers. You are more likely to develop it if it runs in your family.
b. the symptoms displayed?
Long-sightedness: Long-sightedness can cause blurred vision, headaches and tired eyes.
Short-sightedness: Short-sightedness causes distant objects to appear blurry and unfocused, while nearby objects remain in focus.
c. propose what sort of lens may be used to correct each vision.
Long-sightedness: Convex lenses are used to treat long sightedness, which are specially designed to bend the light so the retina can focus. These lenses are thinner at the edge than in the centre.
Short-sightedness: Concave lenses are used to treat short-sightedness. These are thinner in the middle.
