To see a small object. Object observed with a magnifying glass seems bigger. The magnifying power is the ratio between the angle of the eyes observing the image of the object using the magnifying glass and the angle of the eyes directly observing the object with maximum accomodation.
The magnification power :
where Sn is the near point ( typically 25 cm), d is the distance between the eyes and the glass.
For d = 0
maximum magnification is obtained when the image is at the near point,
the angular magnification become :
minimum magnification is obtained when the image is at the far point, then
the angular magnification become :
If the image is laid between the near point and far point then
the angular magnification become :
Note : for myopia eyes, when the image is at the far point, then 
The distance of the object from the lens can be determined by the formula
These are really cool glasses.
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