PRISMS - INTRODUCTIONS AND BASICS. USES AND CLINICAL APPLICATIONS OF PRISM IN OPHTHALMOLOGY

This video explains about basics about prism and prentice's rule and how prisms are used for treatment of various ophthalmological conditions.
it helps optometry students to get better knowledge about basics of prism

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I have an observation, in demonstrating how prism works using three cross hair diagrams, you said placing the prism parallel to the horizontal... But looking at the placement of the prism, it was either placed parallel to the vertical line or perpendicular to the horizontal line. Now, my question is this, why did you say it is placed parallel to horizontal line in case of prism 1? All the same, i appreciate the video and would like you to do more. Thanks a lot