ABO NOCE Practice Test

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What visual effect occurs with a Base In prism?

  1. Objects appear closer together

  2. Objects appear further apart

  3. Objects are not affected

  4. Objects appear to spin

The correct answer is: Objects appear closer together

When a Base In prism is present, it causes light rays to bend towards the nose of the viewer, which creates the visual effect of objects appearing closer together. This effect occurs because the prism essentially shifts the perceived location of objects in the visual field inward towards the center. As a result, the natural separation between objects in the visual field is diminished, leading to the perception that they are more closely positioned to one another. This characteristic of a Base In prism is particularly useful in certain optical corrections and enhances the understanding of how prisms influence visual perception.

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