Yes, Eagle Eye is free on MentalMath and playable without registration.
Keeping your gaze on the center while catching something at the edges widens peripheral vision. This helps take in text faster while reading and stay aware of surroundings.
The game is simple, so it suits children from age 6. Practicing side vision is engaging even for younger kids.
Yes, it works on phones, tablets, and computers. On a smaller screen the center and edges are close, which still gives useful practice.
Short sessions of up to 5 minutes a day are enough so the eyes do not tire. Regular repetition gradually widens peripheral perception.