Cockroach



  • What is the meaning of cockroach's vision has more sensitivity and low resolution?

    What is the meaning of apposition & superposition image? How are the different?

    What type of vision do humans have?
    Please explain.



  • @anag
    Cockroaches can see in near-darkness due to the many light-sensing cells in their eyes that pool a tiny number of light signals over space and time. ... This pooling probably occurs over thousands of photoreceptors in the eye,

    cockroach has compound eye s.The photoreceptors sense of the inherently unreliable light signals at low luminance and for optimization of vision in its mainly dim living conditions.



  • @anag
    The superposition eye is divided into three types; the refracting, the reflecting and the parabolic superposition eye. ... The result is an image at half the radius of the eye, which is where the tips of the rhabdoms are. This kind is used mostly by nocturnal insects
    The apposition image
    when light intensity is high or light is sufficient, iris pigment sheath remain intent.
    This is perceived in bright light, when pigment cells in the dioptrical and sensory regions spread and completely ...
    separate the ommatidia from each other, so that the angle of vision of an ommatidium is only 1 degree and light rays coming directly from the front can only enter the ommatidium, whereas the light rays coming at an angle are absorbed by the pigment before they can reach rhabdomes.



  • @anag
    Humans are also able to perceive three-dimensional images because they possess binocular vision



  • @sunitasaxena is it apposition or superposition image or none?

    Which one do humans have?

    1. high resolution
    2. Low resolution
    3. High sensitivity
    4. Low sensitivity


  • @anag human eye has high resolution

    I don't think it must have high sensitivity as after staying for longer period in sun when we come to dark room it takes some time for our eyes to adjust..But human eye has better resolution even than any camera
    Correct me if I am wrong



  • @sri
    You are right
    At this level of light, the rods are most active and the human eye is more sensitive to the light present, and less sensitive to the range of color. Rods are highly sensitive to light but are comprised of a single photo pigment, which accounts for the loss in ability to discriminate color

    , the eye plus brain assembles a higher resolution image than possible with the number of photoreceptors in the retina. 1201206060/(0.30.3) = 576 megapixels. The full angle of human vision would require even more megapixels.



  • @sunitasaxena So human eye has high resolution & the rod cells in human eye are highly sensitive to light. Right?

    But are the cones (responsible for colour vision) highly sensitive to light? Please explain.



  • @anag
    They both are photoreceptor cells responsible for colour vision cone work better in bright light and rods function when there is dim light


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