2007 Sensory Physiology

Refraction

  • in order to reach the photoreceptors in the retina, light must pass through several transparent structures that refract the light - as a result, the image is:
    1. inverted and reversed
    2. focused
  • both the cornea and the lens have convex surfaces that cause light rays to be focused on the retina
    • although the refractive power of the cornea is greater than the lens, the power of the lens can be changed as needed to focus light from near or far objects - this adaptive process is called accomodation

Eye refraction

S&G Figure 10.24

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