Difference between Least and Far Distance of distinct vision
Least Distance of distinct vision
1) We know the focal length of normal human eye is 2.5 cm.
2) To see the object clearly, without any strain on eyes object should keep at certain minimum distance from eyes.
3) For normal human eye, the minimum distance up to which one can see the object clearly without any difficulty is called as least or minimum distance of distinct vision (DDV).
4) This distance is also known as near point of eye.
5) The value of least distance of distinct vision for normal human eye is 25 cm.
Far Distance of distinct vision
1) We know the focal length of normal human eye is 2.5 cm.
2) Distinct objects are appearing to at certain infinite distances from the eyes when it is seen without stress.
3) For normal human eye, the maximum distance up to which one can see the object clearly without any difficulty is called as far or maximum distance of distinct vision (DDV).
4) This distance is also known as far point of eye.
5) The value of least distance of distinct vision for normal human eye is infinity.