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  • Why is a normal eye not able to see the objects placed closer than 25cm?  

Why is a normal eye not able to see the objects placed closer than 25cm?

 

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A normal eye is not able to see objects placed closer than 25cm due to the limited accommodation of the eye lens, which causes an image to be blurred. The ciliary muscles adjust the curvature of the eye lens to focus light on the retina. The process of lens adjustment is as follows;

  1. The lens has to be extremely convex (thicker) to focus light when an object is too close.  
  2. The lens bends as maximum possible, though it loses its ability to focus the image.
  3.  For a typical eye, the near point that is also known as the least distance of distinct vision, is around 25 cm (the shortest distance at which the eye can see an object clearly and strain-free).
Posted by

Saniya Khatri

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