The Canadian Journal of Industry, Science and Art, Volume 11

12 inches accommodation according advances animal aperture appear authors become brought called Calm cause characters classification combination common concave convergent convex lens copy correct directed distance distant objects distinct diverging divisions edition effect enable English equal errors expression fact feet flame focus four front give given glasses greater groups hour hypermetropia idea inch lens increase instance inverted kingdom least length lenses less letters light means MEETING miles mind misprint myopia natural necessary normal objects observed optical original parallel rays particular pass passage patient pencil persons position present principle printed Prof range received referred refractive relations remark render represents resemblance respect retina seen sense simply spectacles strength structure supposed taken Toronto vision writing