allow modification of the color of the light sent to camera of the visual prosthesis to respond to different environments users may choose the best filter to suit their needs in real time application_number US 201113097449 A description the glasses or visor 1 may have a sliding lens cover 7 that can be placed in front of the camera 3 lens on the visor 1 as shown in fig1 the camera may be mounted in the bridge of the glasses the sliding lens cover 7 may be made of dark shade transparent material to limit the intensity of light falling on the camera 3 lens based on the ambient light conditions the user can utilize this feature to limit bright light the sliding cover 7 material may provide a choice of nd normal density graded neutral density normal density plus ultraviolet nd uv color filters high contrast filters or there filters as are commonly known for use for eye glasses desired available filters can be combined into a single lens cover and placed linearly side by side incorporating a longer sliding travel each section of filter can come in front of the lens for desired effect fig2 and 3 show two different perspective views of an external portion of a visual prosthetic apparatus according to the present disclosure u2018 external u2019 is here meant to indicate that.