ADNS-5050 components needed
That's a terrible diagram, it should really say what the  units of these are. (also, when you compare the symbol of C1 and C3, it seems like it wasn't drawn with software that has component symbols, but by hand ... not a good sign for documentation quality.)
However, seeing the values: Unit is most likely µF. Watch out, C2 and C4 are polarized caps (i.e. electrolytic ones) and thus their orientation matters.
Also, note that if a device needs both such large capacitances as 3.3 µF and 4.7 µF in electrolytic capacitors as well as high-frequency 0.1 µF (= 100 nF) capacitors, at least the ceramic capacitors should be placed very close to the chip. (The schematic &quot;suggests&quot; that wrong, and this raises even more questions about documentation quality).
The company was later bought by Avago, then that got bought by Broadcom. They reworked the datasheets for most devices from the ADNS-series, but it seems they never got around to fixing the ADNS-5050 data sheet schematics. It's not the same device, so don't take anything said there as true, but you might want to also browse the Broadcom ADNS-5070 datasheet if any concepts remain unexplained in the ADNS-5050 datasheet.