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The resolving power of an objective lens is measured by its ability to differentiate two lines or points in an object. The greater the resolving power, the smaller the minimum distance between two lines or points that can still be distinguished. The larger the N.A., the higher the resolving power.
A circular opening is similar to the single slit just discussed, except that it exists in two dimensions instead of one. It causes its own form of diffraction pattern. In optical systems, any lens or mirror (e.g. a camera lens or the lens in the human eye) will make an image in which light from each point in the object is spread out over a certain region surrounding the point that is supposed to be (according to geometric optics) its image point. This causes a certain amount of blurring in the image.
The human eye is an organ that reacts to light in many circumstances. As a conscious sense organ the human eye allows vision; rod and cone cells in the retina allow conscious light perception and vision, including color differentiation and the perception of depth. The human eye can distinguish about 10 million colors.
The actual resolving power of the human eye with 20/20 vision is typically considered to be about one arc minute or 60 arc seconds, which is about one-third of the theoretical resolution we just calculated based solely on the diameter of the pupil.
Resolving power is the ability of the eye, or an optical instrument, to differentiate between two points or lines. It is typically expressed as an angle of separation radiating outward from the eye or instrument. When resolving power is expressed as an angle, simple geometry permits us to calculate the relationships between viewing distance and line or point separations.

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