I hope this helps. I divided the text into short paragraphs.

Recommendation #1: Visual accommodations and activity to help Mr. S. track an object. The materials used in his instruction should include visual accommodations such as considering the size of the objects, the contrast between the object and the background, and spacing between the object and the surrounding background objects. 

He relies on using his right eye because of his ptosis (a drooping eyelid on his left eye) and his visual field is limited. Therefore, the angle and height of the AT device’s position must be taken into consideration. For example, during a learning activity, use a brightly colored object on a large black paper as a background (e.g., hanging against the wall). Not facing the entire classroom may allow him to control his eye and focus on the target. Use of a mounting system for an AAC or an iPad will help him see the objects on the screen. 

Activity: Practice focusing one object (or target) by using low-tech (e.g., bright colors) and expand to a Yes and No activity with him using his right eye. If a Smartboard or a projector is available for him, then enlarging the objects on the screen can help him expand his learning in line with the other students.