Why do the values of least distance of distinct vision and angle of vision change with person and age ?

Why do the values of least distance of distinct vision and angle of vi

1.	Why do the values of least distance of distinct vision and angle of vision change with person and age ?
Answer» Solution :1) The ciliary muscle which attached with eye lens HELPS the eye to change its focal length by changing RADII of CURVATURE of eye lens. 2) When the eye is focussed on a distant object, the ciliary muscles are relaxed so that the focal length of eye lens has its maximum value which is equal to its distance form the RETINA. 3) the working of ciliary muscles in eye changes fromperson to person. 4) So, the values of least distance of distinct vision and ANGLE of vision changes with person and age.