My home has a window that is too high for me to see anything except trees and sky. I sit in a wheelchair and cannot get close enough to the window to see my driveway below the window. The first picture is the view I normally have through that window.
The second picture is a close-up view of the same window. I cannot see anything except trees and sky. But, I need to see if someone is in my driveway. Frustrating!
An inexpensive solution is to buy a $10.00 wide-angle, flexible plastic, Fresnel lens which can be semi-permanently stuck to the window using water. This particular one is advertised as a better way to see what is behind a van. You stick this lens on your van's back window and it gives you a much wider rear view from the driver's seat. The lens gives a different view depending on whether you see through the front or the back side of the lens. Viewed frontwards, as in this picture, you get a view where lines (like trees or telephone wires) appear to be straight.
If the lens is viewed from the back side, (as seen in the final picture) you get an even wider-angled view, but straight lines appear to be curved close to the edge of the lens. For my driveway window, I use the lens backwards because it gives the widest view possible. It also shows objects that are lower than I can normally see. Many companies make Fresnel lenses. This particular one came from 3Dlens.com.