The size of an eye does not directly determine the smallest object it can see. Visual acuity, which refers to the ability to discern fine details, is primarily influenced by the structure and function of the retina and the quality of the optics of the eye.
The human eye has a remarkable ability to resolve small details, and the smallest object it can perceive is determined by the resolving power of the eye, which is measured in terms of angular resolution. Angular resolution is the smallest angle between two points at which they can still be distinguished as separate entities.
The angular resolution of the human eye is generally considered to be around 1 arc minute, which is equivalent to 1/60th of a degree. However, this value can vary between individuals and under different conditions.
To give you an idea of what this means, if we assume an average viewing distance of 10 inches (25.4 cm), the smallest object that could be resolved by the human eye would have a size of approximately 0.0024 inches (0.06 mm) or 60 micrometers.
It's important to note that this calculation is based on the assumption of normal visual acuity and does not take into account factors such as lighting conditions, contrast, and other visual factors that can affect the ability to see small objects. Additionally, the weight of an eye does not have a direct correlation with visual acuity or the ability to resolve small details.