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  • The minimum distance at which a person can comfortably and uniquely see an object is called the least distance specific vision.
  • The minimum distance of vision of a normal healthy human being is about 25 cm.
  • There are mainly three common defects of vision. They are
    • myopia
    • Long sight
    • Zardarsight


  • Some people cannot see the object over long distances, but can clearly see nearby objects called myopia
    • Also called “myopia”
    • The maximum focal length for these people is less than 2.5 cm

Long sight

  • It is also known as foresight
    • Individuals with hypermetropia can see distant objects clearly but cannot see objects at close distances
    • The minimum focal length of the eye lens is greater than 2.27 cm for a person with hypermetropia


  • It is a vision defect when the accommodation potential of the eye usually decreases with aging.
    • For most people, the near point slowly fades away.
    • They find it difficult to see the surrounding objects clearly and clearly

Scatter light

  • Is a complex phenomenon
    • Atoms or molecules that come in contact with light absorb light energy and emit some part of light energy in different directions.
    • The effect of light on a molecule or atom depends on the size of the atom or molecule.
    • CV Raman explained the occurrence of light spills in gases and liquids.

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