Eye sight is measured in each eye separately ,in order to detect any visual defects in each eye separately .if you see through both eye ,if vision of one eye is good it will try to compensate the visual loss of other eye. read more
While searching about laser surgery for my myopia, I came across different system to measure the quality of individuals' eye sight. When speaking about quality of eyesight, I am referring to the classic test where one has to read smaller and smaller symbols (usually letters or numbers). read more