Fig. 1.

(Top) Schematic diagram of the designed optical attachment for wide-field fluorescent imaging on a cell-phone. (Middle and Bottom) Different views of the fluorescent imager prototype. This entire attachment to the cell-phone weighs ~28 g (~1 ounce) and has dimensions of ~3.5 × 5.5 × 2.4 cm. This compact and light-weight unit can be repeatedly attached and detached to the cell-phone body without the need for any fine alignment, making its interface fairy easy to use.