Sensory processing / hypo sensitivity

Hi,

I wonder if there is someone that experience hypo sensitivity in vision. I think that my child has hypo vision. And i wonder how someone with hypo vision can experience world. I was reading about hypo vision and I found that someone with hypo vision may see just outlines of objects and may see everything darker. I wonder if someone knows or have experienced or have read about how it is to have hypo vision? Do they see people and objects dark like silhouette in the dark or is it like sitting in a dark room with a little light?