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Person APerson BPerson CPerson DPerson EMaximum focal length of eye is less than 2.5 cmCannot see nearer objects clearlyMinimum focal length of eye lens is greater than 2.27 cm.Lost the ability of accommodation of eyeThe limits of the focal length of eye lens are from 2.5 cm - 2.27 cmAnswer the following questions from the above information. i) What is the defect of vision in ‘D’ suffering from? Why does it happen? ii) Whose defect of vision can be corrected by using Biconcave lens? iii) Who is suffering with similar defect of vision as of ‘B’? iv) Who among the above do not have any defect of vision? |
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Answer» i) 1) The vision defect of person ‘D’ is presbyopia. 2) Presbyopia happens due to gradual weakening of ciliary muscles and diminishing flexibility of the eye lens. This effect can be seen in aged people. ii) Person A’ defect of vision can be corrected by using Biconcave lens. iii) Person ’C’ is suffering with similar defect of vision as of ’B’. iv) Person ‘E’ has no defect of vision. |
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