SSC General Science & Technology Sample Paper NCERT Sample Paper-2

  • question_answer
    Consider the following statements:
    1. For a normal human eye, the least distance of distinct vision of 25 cm.
    2. The person suffering of colour blindness cannot distinguish the red and green colours distinctly.
    3. The colour blindness depends on various defects of the cylindrical (conical) cell of the retina.
    4. The presbyopia affected person uses bifocal lens and cylindrical lens. Which of the statements given above are correct?

    A)  1, 2 and 4

    B)         2 and 3

    C)  2 and 3

    D)  1, 2 and 3

    Correct Answer: D

    Solution :

    [d] Presbyopia is an age-related condition that causes blurred near vision. It typically starts at around age 40 and affects everyone, even those who've never had vision problems before. When presbyopia begins, people will squint or hold reading materials at arm's length to help their eyes focus. Eye strain, headache and fatigue are common symptoms of presbyopia. Most experts believe presbyopia is caused by changes to the lens inside the eye. As people age, the lens becomes harder and less elastic, making it more difficult for the eye to focus on close objects. For centuries presbyopia was corrected with the use of bifocal eyeglasses. Today there are many ways to correct presbyopia with eyeglasses, and surgery.

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