| The card contained rows of numbers and figures that progressed from a larger angular subtense at the top to a smaller angular subtense at the bottom. |
| The controlled magnification optics as well as a compact design allow for a small subtense angle and increased efficiency. |
| Figure 5 shows the contrast sensitivity function for sine-wave gratings of equivalent subtense. |
| Angular magnification is achieved by telescopes or binoculars and increases the angle of subtense of the image at the eye. |
| Relative distance magnification is achieved when the distance to the object is decreased, thereby increasing the angular subtense of the object. |
