Ocular dominance

Approximately two-thirds of the population are right-eye dominant and one-third left-eye dominant; however, in a small portion of the population neither eye is dominant. Dominance does appear to change depending upon direction of gaze due to image size changes on the retinas. There also appears to be a higher prevalence of left-eye dominance in those with Williams--Beuren syndrome, and possibly in migraine sufferers as well. Eye dominance has been categorized as ``weak'' or ``strong''; highly profound cases are sometimes caused by amblyopia or strabismus.

Question: is one eye always stronger than the other
Answer: no