one's dominant eye

dominance (e.g. of left or right hand)

immediate effect; instant effect

effect; effectiveness; efficacy; virtue; benefit

to use (tact, wit, etc.); to exercise; to display

effects (e.g. sound effects, visual effects, special effects)

yuko (judo)

efficiency

invalid; void; ineffective; unavailable

medical efficacy; effect of a medicine

effective; successful

practical effect; efficacy; efficiency