Anatomy

Retinal Anatomy

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Retinal Anatomy, Retina Anatomy, Retina, Macula, Fovea

  • Anatomy
  1. Retina
    1. Lines the globe inner surface and contains light sensitive Neurons that transmit signals to the Optic Nerve
    2. Photoreceptors (rods and cones) comprise the inner, sensory layer of the Retina
  2. Macula
    1. Retinal region responsible for central vision
    2. Lies two disc diameters lateral to the optic disc
  3. Fovea
    1. Subpart of the Macula with highest Visual Acuity (and highest cone density)
  4. Images
    1. eyeRetinaGrayBB879.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
    2. eyeRetinaMicroGrayBB882.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
    3. eyeRetinaMicroGrayBB881.gifLewis (1918) Gray's Anatomy 20th ed (in public domain at Yahoo or BartleBy)
  • Physiology
  • Color Vision
  1. Retina have three types of color detecting cone photoreceptors that roughly correlate with red, green and blue Perception
  2. Photoreceptors are most sensitive to light at peak wavelengths along the light spectrum
    1. Long (Red): 564–580 nm
    2. Medium (Green): 534–545 nm
    3. Short (Blue): 420–440 nm
  3. Each of the cone types are stimulated by light of a wider range that overlaps with other cone types
    1. However, cone firing will be maximal when stimulated in their peak range
    2. Combination of the individual firing of these three cone types will be interpreted as specific color variations