Activity 3.2 Foveal Acuity START Introduction The fovea, located directly behind

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Activity 3.2 Foveal Acuity START Introduction The fovea, located directly behind the pupil and lens, is the area of the retina that provides the highest degree of visual acuity. In other words, you see an object most clearly when its image falls on the fovea. Furthermore, the farther an object's image moves away from the fovea and into the periphery, the less clear it will be. LO TL You usually don't notice this falloff in acuity because whenever you need to identify an object, you look directly at it so its image falls on the fovea. In this activity, you will be forced to identify images in both the fovea and the periphery, allowing you to observe the advantage of foveal over peripheral vision. Position: Foveated Instructions Sequential Random In this activity you will do a short experiment demonstrating the acuity advantage of central over peripheral areas of the retina. In each trial of the experiment, you will see a sequence of three letters somewhere in the rectangle above. Your task is to identify the middle letter of the sequence by clicking on the letter in the red box. Start each trial by clicking the START button, then fixing your gaze on the small red circle. The letters will then appear for a quarter of a second (not long enough for you to move your eyes), and then you should make your guess by clicking that letter in the red box. After each trial, you will see the cumulative results of all the trials you've done so far on the left. By default, the letters will be shown in the center of the screen (foveated) on the first trial, then move sequentially outward from there (Whether the letters appear to the right or left of fixation is randomly determined on every trial.) Use the "Position radio buttons on the lower- left side of the window to select other options: Introduction About The Results · "Foveated" means the central letter will always be in the middle of the screen, so the image will fall on your fovea 1-6 designate positions progressively farther from the fovea (1 is just outside the fovea; 6 is farthest away) Choosing wSequential" will go back to the default option-a sequence of trials starting at the fovea and moving outward. Choosing "Random will cause the position to change randomly from trial to trial

Explanation / Answer

Hi,
The foveal helps us to detect objects with clarity. The peripheral vision is important for braoder picture, but offers no clarity on any one object. In the exercise, if we move our head away from the monitor, the peripheral vision will increase. If we move close to the monitor, the accuracy will decrease and peripheral vision will decrease.

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