The Rayleigh criterion defines the theoretical limit of anything resolvable looking through and aperture, your pupil for example, irrespective of how good your

The Rayleigh criterion defines the theoretical limit of anything resolvable looking through and aperture, your pupil for example, irrespective of how good your retina is. For a pupil diameter of 0.5cm and 500nm light (green), this is 1.22e-4 radians. 1 arcsecond is about 5e-6 radians, or about 25 times smaller than it is theoretically possible to resolve with a pupil that size and that wavelength of light. There is roughly a factor of two for the wavelength and the pupil size each possibly but, it is physically impossible for you to be able to resolve this small.