my own 2

Cards (11)

  • for what are responsible the eyes?
    for the sense of sight
  • what have the eyes
    an eyeball protected by accesory glands and structures
  • three layers of the eye

    retina, choroid and sclera
  • name the parts of the eye
    vitreous humour, optic nerve, retina, choroid, sclera, crystalline lens, aqueous humour, cornea, iris, (pupil)
  • name the accesory structures
    lacrimal glands, eyelids, eyebrows and eyelashes, and lacrimal sac
  • how are images formed in the eye

    Light passes, cornea to the pupil. Opening, can increase or decrease in size, depending of the light. Crystalline lens adapts, bring the image into focus and projects it onto the retina. In the retina, light stimuli. Two types of photoreceptors: • Cones, colours • Rods, peripheral and low light.Photoreceptors in the retina transform the light stimulus into a nerve impulse. Optic nerve to the brain.
  • hypermetropia
    Nearby objects are seen out of focus.Eyeball is too short. • Images are formed behind the retina. • Convex lenses
  • myopia
    Distant objects are seen out of focus.Eyeball is too long. • Images are formed in front of the retina. • Concave lenses.
  • astigmatism
    Abnormal curvature of the cornea.Multiple points of focus in the retina.Special lenses.
  • eye care measures
    Glasses, avoid exposure to sunlight. • Avoid touching your eyes. • Adequate light, avoid reading in low light. • Limit the time in front of electronic devices.
  • parts of the eye involved in sight
    Cornea, focuses the light. Iris/pupil (the hole). Controls the amount of light. Crystalline lens. Deformable lens, focuses the image in the retina. Retina. Detects light. Cones, they detect colours (R, G, B) and they need intense light. Roods, are sensitive, they do not differentiate colours.