Fresnel Lens

A Fresnel Lens Accessory (flat lens) that would clip ahead of the Sansa screen.

This would make the Sansa screen appear larger and be easier to view continuously

over a period of time.

Using an Owl card

works, but you don’t need the light and the lens should be the full size 

of a credit card with clips to hold it to the Sansa.

here is a better view of a credit card fresnel lens

Magnifiers - Credit Card Size Fresnel Lens Magnifier

what has to be added are folding clips to space

the lens in front of the Sansa