What is foresight and nearsightedness in these both which use concave and convex lens. PLEASE EXPLAIN TOMORROW IS MY PAPER

Dear Student, 
Myopia (Nearsightedness)

  • Myopia is a defect of vision in which a person clearly sees all the nearby objects, but is unable to see the distant objects comfortably and his eye is known as a myopic eye. A myopic eye has its far point nearer than infinity. It forms the image of a distant object in front of its retina as shown in the figure.

  • Myopia is caused by

    1. increase in curvature of the lens
    2. increase in length of the eyeball
  • Since a concave lens has an ability to diverge incoming rays, it is used to correct this defect of vision.

Hypermetropia (Foresightedness)

  • Hypermetropia is a defect of vision in which a person can see distant objects clearly and distinctively, but is not able to see nearby objects comfortably and clearly.A hypermetropic eye has its least distance of distinct vision greater than 25 cm.

  • Since a convex lens has the ability to converge incoming rays, it can be used to correct this defect of vision, as you already have seen in the animation.
Regards

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foresight understands the future as an emerging entity that’s only partially visible in the present, not a predetermined destiny that can be fully known in advance (predicted).

Myopia, or nearsightedness, is a condition in which objects in the distance are blurred either because the eye is too long or too strong. It is the result of both environmental and genetic factors.
Description
The degree to which one is myopic depends on the powers of the cornea and the lens of the eye and the length of the eyeball. In a normal eye the incoming visual images meet on the retina in the back of the eye. If these visual images converge in front of the retina instead of on the retina, then one is myopic.

hypermetropia, is a defect of vision caused by an imperfection in the eye (often when the eyeball is too short or the lens cannot become round enough), causing difficulty focusing on near objects, and in extreme cases causing a sufferer to be unable to focus on objects at any distance. As an object moves toward the eye, the eye must increase its optical power to keep the image in focus on the retina. If the power of the cornea and lens is insufficient, as in hyperopia, the image will appear blurred.

 
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