The idea is to use a 2.5" LCD augmented with a lens and play third-person or top-down games where it doesn't matter losing some information on the sides. I will add a playstation-type controller, powered by a battery, and a raspberry pi 3.
I bought this lens to see its effect and even though it appears in the product description x10. I have to move the lens too far away so that it covers the entire diameter. I have to try another one
Before deciding to start the project. I was doing tests to be able to connect the round screen with the Raspberry through the GPIO.
Use an original copy of retropie and the instructions to configure the screen on the following web page which in turn mentions a repository with the necessary drivers.
Placing a magnifying glass between the object and the eye allows the object to be brought closer to the eye, and the eye can focus on the virtual image formed, preferably at the clearest viewing distance. The regular magnification, M, is the ratio between the angle θ' subtended by the image and the angle θ subtended by the object.
A magnifying glass is any positive lens with a focal length less than 250mm. The approximate magnification M provided by the lens is calculated by dividing its focal length by 250.