This invention relates to a light field-modulable optical needle assembly including a coherent light source, a light conduction member and a light modulation member. The light conduction member includes a light incident face that is proximate to the coherent light source, a light exiting face that is opposite to the light incident face and distal from the coherent light source, and a surrounding face that peripherally extends from the light incident face to the light exiting face to be connected therebetween. The light modulation member is disposed proximate to one of the light incident face, the light exiting face and the surrounding face of the light conduction member and is formed with a microstructure. The light emitted from the light field-modulable optical needle assembly has a light output power distribution adjustable by the microstructure of the light modulation member.
