the eye

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    • What is the main focus of today's video?
      The structure of the eye and iris reflex
    • What does a cross section of the eye show?
      A view of the inside of the eye
    • What is the first structure light hits when entering the eye?
      The cornea
    • Why is the cornea transparent?
      To allow all light to pass through
    • How does the cornea obtain oxygen?
      By diffusion from the outside air
    • What is the function of the cornea?
      To refract or bend light
    • What is the colored part of the eye called?
      The iris
    • What does the iris control?
      The size of the pupil
    • What is the pupil?
      A gap in the middle of the iris
    • What is the role of the lens in the eye?
      To refract light and focus it
    • How does the lens differ from the cornea?
      The lens can change its shape
    • What does the retina contain?
      Two types of receptor cells
    • What are cone cells sensitive to?
      The color of light
    • Why can't we see colors in the dark?
      Only rod cells are active in low light
    • What is the fovea?
      A spot on the retina with cone cells
    • What is the function of the optic nerve?
      To transmit impulses to the brain
    • What happens to the pupil in bright light?
      It constricts to reduce light intake
    • What is the purpose of the iris reflex?
      To protect the retina from damage
    • What are the two types of muscles in the iris?
      Circular and radial muscles
    • How do circular muscles affect the pupil?
      They contract to make the pupil smaller
    • What do radial muscles do when it's dark?
      They contract to open the pupil
    • What are the steps of the iris reflex in bright and low light conditions?
      • In bright light:
      • Circular muscles contract
      • Pupil constricts
      • In low light:
      • Circular muscles relax
      • Radial muscles contract
      • Pupil dilates
    • What should you be able to name by the end of the video?
      The different parts of the eye
    • How do the functions of cone cells and rod cells differ?
      • Cone cells:
      • Sensitive to color
      • Function well in bright light
      • Rod cells:
      • Sensitive to light intensity
      • Function well in low light
    • What is the function of the eye as a sense organ?
      It contains receptors sensitive to light
    • What is the role of the cornea and lens in focusing light?
      • Cornea:
      • Refracts light to begin focusing
      • Lens:
      • Changes shape to fine-tune focus
    • What is the transparent front part of the eye called?
      Cornea
    • What is the job of the cornea?
      To start the focusing of light rays
    • What are the main structures of the eye involved in light processing?
      • Cornea
      • Iris
      • Pupil
      • Lens
      • Retina
      • Fovea
      • Optic nerve
    • Through which part do light rays pass after the cornea?
      Pupil
    • What is the iris?
      The colored part of the eye
    • What is the function of the lens?
      To focus light rays onto the retina
    • What is the process called when the lens changes shape?
      Accommodation
    • Where are light rays focused in the eye?
      On the retina
    • What do the receptor cells in the retina detect?
      Light intensity and color
    • What do receptor cells in the retina send to the brain?
      Electrical impulses
    • What is the white part of the eye called?
      Sclera
    • What is the function of the sclera?
      To protect the eye
    • What do the ciliary muscles and suspensory ligaments do?
      They help focus on distant or near objects
    • What is the space in the center of the iris called?
      Pupil