A medical implantable lead of the type being adapted to be implanted into a human or animal body and attached with a distal end to an organ inside the body, has a helix of a helical wire in the distal end which is adapted to be screwed into the organ. The features of the systems and methods described herein may include providing improved resolution and color reproduction. The conductive layer comprises a plurality of independent conductive areas, wherein every conductive area comprises a readout area, a transmissive area and a sensing area, and the transmissive area of every conductive area is packaged by the isolation layer. In addition, after patterning the electrode, an insulating film is formed on the electrode for preventing the Si in the protective coating on the end surface from contacting with Au in the electrode, even when the Si film contacts with a surface of the electrode. The device further comprises: damping element coupled to at least one of the carriage and the spring, and a block and tackle which includes: one fixed end which is attached to a stationary attachment point; one loose end which is connected to the carriage; and one first loose pulley which is connected to a stationary attachment point via the spring. At least one of the light incidence surface and light exit surface is located in a recess area of the sensing part.