Historical Images & Videos on Instagram: "In a moment that moved millions around the world, a baby with a rare visual impairment saw clearly for the first time after receiving special glasses. Cases like this are more common than most people think. Many babies are born with conditions that affect their vision — such as congenital cataracts, ocular albinism, nystagmus, or severe refractive errors. In such cases, early detection and the use of corrective lenses or proper treatments can completely

Statistic vs Parameter & Population vs Sample