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The smallest particle visible to the naked eye is 40 microns. To give you some perspective, a piece of hair's width can range from 40 to 120 microns.
The vertical measure, generally less than the horizontal distance, is about 24 mm among adults, at birth about 16â17 millimetres (about 0.65 inch). The transverse size of a human adult eye is approximately 24.2 mm and the sagittal size is 23.7 mm with no significant difference between sexes and age groups.Strong correlation was found between the transverse diameter and the width of the orbit (r = 0.88).od 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.