eye, rays, image, lens, vision, object, glass, eyes, distance, reflected, retina, cornea, iris, screen, focus, visual, visible, direction, plane, instrument, optic, illumination, central, transparent, intensity, glasses, refraction, camera, observer, front, optical, luminous, colors, sensitive, lines, axis, film, distinct, globe, principal, vitreous, photograph, invisible, illuminated, accommodation, tube, ciliary, reflecting, Light