The goal of this exercise is to make the two images of each card as one image when you are viewing through the aperature slide.
Set up the cards so that the first card you view is the one with the clock towers.
2. In the top right hand corner of the card it tells you your card level as well as where the aperature slider needs to be for each level.
In this example AP 1 is card number 1.
3. Slide the aperature slider to the appropriate designated spot for the card level.
In this example we are sliding the slider to 1&2 for card 1.
4. Place your nose at the end of the instrument. You can manipulate the height of the instrument by the knobs on the side. You are to view this exercise comfortably and as straight as possible. Look through the aperature slider and try to make the image into one. Hold for 10 seconds.
5. Continue by flipping to the next card, and sliding the aperature slider up to the appropriate position it says on the top right hand side of the card. For example for card 3 we will slide down to the marking that has 3. Stop when you are unable to make the image into one anymore.