Stargardt also has an impact on the perception of space. I do not mean the simple oversight of an object on my walking way or on the table. There are moments where the whole space around me loses its third dimension.
Sometimes you see pictures that try to represent the Stargardt. They show a photograph of a person or an object and the centre is a fuzzy blob. This is not quite right. It is true that all things that fit into the blind spot of a Stargardtien are no longer visible. But it is not that we walk around with a blurred spot in the central visual field. The brain fills in the spot. It takes whatever it detects on the edge of the spot, and "paints" it over the sport. For example, when I look straight at a window in a yellow wall, the window is gone and I just see a yellow wall. So I do not even realise that I do not see the window, that it is hidden behind the spot. It's just not there until I move my gaze.
If the environment of the observed object is not uniform, for example, one or more high-contrast lines (heating radiator or blinds), the brain has difficulties coming up with a cover and I get a headache when I watch it for too long.
This filling of the blind spot can also make fail the spatial perception. In these cases, I am missing some details that allow the brain to put together a reasonable scene. I then wonder about the strange annexe in that house and realise only when I look a second or third time that it is actually a gate leading to a courtyard. Or I reach for the wine glass on the translucent club table and reach into the void because I judged the distance wrong. These moments can be quite amusing and instruct me new ways to see the world. But there are also other moments when the world falls apart completely for a brief time and I lose any sense of space. For example, when I walk along a sidewalk on a sunny day. On one hand, a shiny storefront reflects the sunlight onto the pavement and mixes with the dancing shadows of the foliage of some trees that line the street. Then some people are heading my way and their shadows move on the ground and in the shop windows, and I have to concentrate hard to find a gap between the people not to bump into someone. In situations like this with moving lights and shadows and reflections, it may happen that the dimensions fall completely apart. I then have the feeling that I walk on a right angle the floor on a wall and am about to step into a void. Panic strikes and I stop immediately and stay still until my brain get enough information to construct again a meaningful space around me.