A microlens array is a lens array where the lenses are less than a millimeter wide, meaning they are best measured using micrometers, also known as microns.
Lens arrays can be produced using microfabrication techniques, in particular photolithographic techniques.[1]
Lens arrays have been manufactured at the wafer level by Lytro.[2]
Lens arrays have been produced with a distance between lenses of about 125 microns, which is 1/8 of a millimeter.[3]