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.