What did you spend your time doing though? Did you read a lot? Did you draw? Did you spend a lot of time working on things within arms reach? Or did you spend your time staring off into the far yonder? Isn't there a case to be made that sunlight is more of a signal used to help the eyes learn to focus and that by staring at something a foot away with low signal strength the eyes never got the feedback necessary to shape itself to the environment that it needs to work in?