Do people with blue eyes generally have worse sight than people with brown eyes?

No: Generally, visual acuity is not dictated by or correlated with the color of someone's irises. While patterns may be detected randomly in the population, there is no predilection to worse visual acuity in lighter colored eyes.

Not at all: Iris color is determined by the amount of brown pigment it contains. A large amount creates brown eyes; less pigment creates a blue appearance. Eye sight is related to the shape of the eye and health of the retina (film layer) and optic nerve. Some eye conditions can lead to poor vision and blue eyes (ocular albinism), but eye color itself is usually not related to eye sight.