Structure of eye

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  • Structure of eye
    • Retina: the light sensitive layer of cells at the back of the eye - has a hole in it called blind spot where there are no visual receptors coz optic nerve passes out of the eye and blood vessels enter - there is no gap in our vision because of this as the visual cortex fills in the gap with patterns from surroundings
      • the brain seems to first analyse info into lines, angles, shading, movement and other basic features then other brain areas combine these features into meaningful visual experiences
    • cornea: clear membrane at the front of the eye that bends light inward
    • lens: can change shape (accomodation) to focus better
    • iris: circular muscle that controls the amt of light entering the eye
    • pupil: opening at the front of the eye through which light passes
    • image sensors - face the back of the eye and light reaches them through the layers of retina
      • rods: visual receptors for dim light that produce only black and white sensations - much more sensitive to light than cones
      • cones: visual receptors for colors and daylight visual activity
      • they affect visual acuity: sharpness of a visual perception
    • fovea: an area at the center of the retina containing only cones - they produce the sharpest images
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